#include <iostream>
#include <random>
#include <map>
#define int long long
using namespace std;
const int B = 3333;
random_device rd;
mt19937 rng(rd());
uniform_int_distribution<int> mtrand(1, 1000000000);
map<int, int> mp;
int mx;
int get(int x) {
    if (x <= B) 
        return mtrand(rng);
    else if (x <= B * 2) 
        return 1;
    else if (x == B * 2 + 1) 
        return mx;
    return B;
}
int S = 1, N;
int query(int x) {
    cout << "walk " << x << endl;
    cin >> S;
    // S = (S + x - 1) % N + 1;
    return S;
}
int pre[10005];
int gcd(int a, int b) { return b ? gcd(b, a % b) : a; }
signed main() {
    // cin >> N;
    int cur, n = 0;
    for (int i = 1, x; i <= 10000; i++) {
        cur = query(x = get(i));
        pre[i] = pre[i - 1] + x;
        if (mp.count(cur)) {
            // cout << cur << " " << mp[cur] << "\n";
            n = gcd(n, pre[i] - pre[mp[cur]]);
        }
        mp[cur] = i;
        mx = max(mx, cur);
    }
    cout << "guess " << n << endl;
    return 0;
}