#include <bits/stdc++.h>   using namespace std;   template <typename Arg1>   void __f(const char* name, Arg1&& arg1) {     cerr << name <<   :   << arg1 << std::endl;   }   template <typename Arg1, typename... Args>   void __f(const char* names, Arg1&& arg1, Args&&... args) {     const char* comma = strchr(names + 1,  , );     cerr.write(names, comma - names) <<   :   << arg1 <<   |  ;     __f(comma + 1, args...);   }   const int N = 1510;   int DP[27][N][N];   int ans[27][N];   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n;     cin >> n;     string s;     cin >> s;     memset(DP, 0, sizeof(DP));     memset(ans, 0, sizeof(ans));     DP[s[0] -  a ][0][0] = 1;     for (int i = (int)1; i < (int)N; i++) DP[s[0] -  a ][0][i] = 1;     for (char ch =  a ; ch <=  z ; ch++) {       if (s[0] == ch) continue;       for (int i = (int)1; i < (int)N; i++) DP[ch -  a ][0][i] = 1;     }     for (int i = (int)1; i < (int)(int)(s.size()); i++) {       for (char ch =  a ; ch <=  z ; ch++) {         if (s[i] == ch) {           int len = 0;           for (int k = i; k >= 0; k--) {             if (s[k] != ch) break;             len++;           }           DP[ch -  a ][i][0] = len;         }         for (int j = (int)1; j < (int)N; j++) {           if (ch == s[i])             DP[ch -  a ][i][j] = 1 + DP[ch -  a ][i - 1][j];           else             DP[ch -  a ][i][j] = 1 + DP[ch -  a ][i - 1][j - 1];         }       }     }     for (char ch =  a ; ch <=  z ; ch++) {       for (int j = 0; j < N; j++) {         for (int i = (int)0; i < (int)(int)(s.size()); i++)           ans[ch -  a ][j] = max(ans[ch -  a ][j], DP[ch -  a ][i][j]);       }     }     int q;     cin >> q;     for (int i = (int)0; i < (int)q; i++) {       int m;       char ch;       cin >> m >> ch;       cout << ans[ch -  a ][m] << endl;     }     return 0;   }   