#include <bits/stdc++.h>   using namespace std;   signed main() {     long long t;     cin >> t;     while (t--) {       long long n;       cin >> n;       char c;       cin >> c;       string str;       cin >> str;       long long ctr = 0;       long long k = 0;       for (long long i = 0; i < n; i++) {         if (str[i] != c) {           ctr++;           k = i;         }       }       if (ctr == 0) {         cout << 0;       } else if (ctr == 1) {         if (k == n - 1) {           cout << 1 <<   n ;           cout << k;         } else {           cout << 1 <<   n ;           cout << k + 2;         }       } else {         long long flag = 0;         for (long long i = n - 1; i >= n / 2; i--) {           if (str[i] == c) {             flag = i;             break;           }         }         if (flag) {           cout << 1 <<   n ;           cout << flag + 1;         } else {           cout << 2 <<   n ;           cout << n <<     << n - 1;         }       }       cout <<   n ;     }     return 0;   }   