#include<bits/stdc++.h>
using namespace std;

const int mod = 1000000007;
using mat = vector<vector<int>>;

struct ModInt{
    int x;
    ModInt (int x = 0): x(x + (x < 0)*mod - (x >= mod) * mod){}
    ModInt operator+(ModInt o) {return x + o.x; }
    ModInt operator-(ModInt o) {return x - o.x; }
    ModInt operator*(ModInt o) {return 1LL * x * o.x % mod;}
    ModInt operator/(ModInt b) {return *this * b.inv();}
    ModInt inv() {return pow(mod - 2);}
    ModInt pow(long long e){
        if(!e)return 1;
        ModInt r = pow(e/2); r = r * r;
        return e % 2 ? *this * r : r;
    }
    bool operator==(ModInt o){return x == o.x;}
    bool operator>(ModInt o){return x > o.x;}
};

pair<vector<int>, int>RowEchelon(vector<vector<ModInt>>& A){
    int n = A.size(), m = A[0].size(), sgn = 1;
    vector<int>piv;
    for(int i = 0, rnk = 0; i < m && rnk < n; ++i){
        for(int j = rnk + 1; j < n; j++)
            if(A[j][i]>A[rnk][i])
                swap(A[j], A[rnk]), sgn = -sgn;
        if(A[rnk][i] == 0)continue;
        for(int j = 0; j < n; j++){
            ModInt coef = A[j][i] / A[rnk][i];
            if(j == rnk || coef == 0)continue;
            for(int k = 0; k < m; k++){
                A[j][k] = A[j][k] - coef * A[rnk][k];
            }
        }
        piv.push_back(i);++rnk;
    }
    return {piv, sgn};
}

vector<ModInt>SolveLinear(vector<vector<ModInt>>& A){
    int m = A[0].size() - 1;
    auto piv = RowEchelon(A).first;
    if(piv.size() > m)return {};
    vector<ModInt>sol(m, 0);
    for(int i = 0; i < (int)piv.size(); i++){
        sol[piv[i]] = A[i][m] / A[i][i];
    }
    return sol;
}

vector<int>left_mult(vector<vector<int>>A, vector<int>b){
    vector<int>res(b.size(), 0);
    int n = b.size();
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            res[i] = (res[i] + ((long long)A[i][j]*b[j])%mod)%mod;
        }
    }
    return res;
}

vector<int>right_mult(vector<vector<int>>A, vector<int>b){
    vector<int>res(b.size(), 0);
    int n = b.size();
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            res[i] = (res[i] + ((long long)A[j][i]*b[j])%mod)%mod;
        }
    }
    return res;
}

vector<int>vecmin(vector<int>v, vector<int>u){
    assert(v.size() == u.size());
    vector<int>res(v.size());
    for(int i = 0; i < (int)v.size(); i++){
        res[i] = (v[i] - u[i])%mod;
    }
    return res;
}


vector<ModInt>solve(const mat &A , int col){
    int n = A.size();
    vector<int>b(n, 0);
    b[col] = 1;
    vector<vector<ModInt>>S(n, vector<ModInt>(n+1));
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            S[i][j] = A[i][j];
        }
    }
    for(int i = 0; i < n; i++){
        S[i][n] = b[i];
    }

    vector<ModInt>res = SolveLinear(S);
    return res;

}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    mt19937 rng(124981);
    int n;
    cin >> n;
    vector<vector<int>>A(n, vector<int>(n)), C(n, vector<int>(n));
    for(auto &row : A){
        for(auto &x: row)cin >> x;
    }
    for(auto &row : C){
        for(auto &x: row)cin >> x;
    }
    vector<int>r(n);
    vector<int>cols;
    for(auto &x : r)x = rng()%mod;
    // vector<int>prod = left_mult(C, left_mult(A, r));
    // for(int i = 0; i < n; i++){
    //     if(prod[i] != r[i])rows.push_back(i);
    // }
    vector<int>prod = right_mult(C, right_mult(A, r));
    for(int i = 0; i < n; i++){
        if(prod[i] != r[i])cols.push_back(i);
    }
    if(cols.empty()){
        cout << "0\n";
        return 0;
    }
    vector<pair<pair<int,int>, int>>ans;
    for(int col : cols){
        auto res = solve(A, col);
        for(int j = 0; j < n; j++){
            if(C[j][col] != res[j].x){
                ans.push_back({{j+1, col+1}, res[j].x});
            }
        }
    }
    sort(ans.begin(), ans.end(), [](pair<pair<int,int>, int>a, pair<pair<int,int>, int>b){
       if(a.first.first == b.first.first)return a.first.second < b.first.second;
       return a.first.first < b.first.first; 
    });
    cout << ans.size() << '\n';
    for(auto p : ans)cout << p.first.first << ' ' << p.first.second << ' ' << p.second << '\n';
    return 0;
}