#include<bits/stdc++.h>
#define rep(i,j,k) for(int i=j;i<=k;i++)
#define repp(i,j,k) for(int i=j;i>=k;i--)
#define ls(x) (x<<1)
#define rs(x) ((x<<1)|1)
#define mp make_pair
#define sec second
#define fir first
#define pii pair<int,int>
#define lowbit(i) i&-i
#define double long double
#define int long long
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
const int N=2005,M=15,S=(1<<8)+5,inf=(ll)1e18+7,mo=1e9+7;
const double eps=1e-8;
void read(int &p){
	int x=0,w=1;
	char ch=0;
	while(!isdigit(ch)){
		if(ch=='-')w=-1;
		ch=getchar();
	}
	while(isdigit(ch)){
		x=(x<<1)+(x<<3)+ch-'0';
		ch=getchar();
	}
	p=x*w;
}
int quick_power(int base,int x){
    int res=1;
    while(x){
        if(x&1)res*=base,res%=mo;
        base*=base,base%=mo;
        x>>=1;
    }
    return res;
}
int n,a[N][N],b[N][N],rdm[N],resm[N];
vector<int>inch,incl;
bool wrh[N],wrl[N];
mt19937 rd(time(0));
int k[N][N];
int rdn(int x,int y){
    return rd()%(y-x+1)+x;
}
int gres[N];
void gauss(int numx){
    rep(i,1,numx){
        int r=i;
        rep(j,i+1,n)
            if(k[j][i]>k[r][i])r=j;
        swap(k[i],k[r]);
        int div=k[i][i],invd=quick_power(div,mo-2);
        //printf("!!!%lld %lld\n",div,invd);
        rep(j,i,numx+1)
            k[i][j]*=invd,k[i][j]%=mo;
        rep(j,i+1,n){
            int mul=k[j][i];
            rep(l,i,numx+1)
                k[j][l]+=mo-mul*k[i][l]%mo,k[j][l]%=mo;
        }
        if(n==1995){puts("!");
        rep(j,1,n){
            rep(l,1,numx+1)
                printf("%lld ",k[j][l]);
            puts("");
        }}
    }
    repp(i,numx,1){
        gres[i]=k[i][numx+1];
        rep(j,i+1,numx)
            gres[i]+=mo-gres[j]*k[i][j]%mo,gres[i]%=mo;
        if(n==1995)printf("gres:%lld %lld\n",i,gres[i]);
    }
}
struct answer{
    int x,y,v;
    friend bool operator<(answer x,answer y){
        if(x.x!=y.x)return x.x<y.x;
        else return x.y<y.y;
    }
};
vector<answer>ans;
signed main(){
    read(n);
    rep(i,1,n){
        rep(j,1,n)
            read(a[i][j]);
    }
    rep(i,1,n){
        rep(j,1,n)
            read(b[i][j]);
    }
    //check columns
    rep(i,1,n)
        rdm[i]=rdn(1,1000000000);
    rep(i,1,n){
        resm[i]=0;
        rep(j,1,n)
            resm[i]+=a[j][i]*rdm[j]%mo,resm[i]%=mo;
    }
    swap(rdm,resm);
    rep(i,1,n){
        int yv=resm[i];
        resm[i]=0;
        rep(j,1,n)
            resm[i]+=b[j][i]*rdm[j]%mo,resm[i]%=mo;
        if(resm[i]!=yv)incl.push_back(i),wrl[i]=1;
    }
    //check rows
    rep(i,1,n)
        rdm[i]=rdn(1,1000000000);
    rep(i,1,n){
        resm[i]=0;
        rep(j,1,n)
            resm[i]+=a[i][j]*rdm[j],resm[i]%=mo;
    }
    swap(rdm,resm);
    rep(i,1,n){
        int yv=resm[i];
        resm[i]=0;
        rep(j,1,n)
            resm[i]+=b[i][j]*rdm[j]%mo,resm[i]%=mo;
        if(resm[i]!=yv)inch.push_back(i),wrh[i]=1;
    }
    //count the answer for each wrong column.
    for(auto nwl:incl){
        rep(i,1,n){
            int cntx=0;
            k[i][inch.size()+1]=(i==nwl);
            rep(j,1,n){
                if(wrh[i])k[i][++cntx]=a[i][j];
                else k[i][inch.size()+1]+=mo-a[i][j]*b[j][nwl]%mo,k[i][inch.size()+1]%=mo;
            }
        }
        if(n==1995){rep(i,1,n){
            rep(j,1,inch.size()+1)
                printf("%lld ",k[i][j]);
            puts("");
        }}
        gauss(inch.size());
        int cntx=0;
        rep(i,1,n){
            if(!wrh[i])continue;
            if(gres[++cntx]!=b[i][nwl])ans.push_back((answer){i,nwl,gres[cntx]});
        }
    }
    sort(ans.begin(),ans.end());
    printf("%lld\n",ans.size());
    for(auto i:ans)
        printf("%lld %lld %lld\n",i.x,i.y,i.v);
    return 0;
}