#include <bits/stdc++.h>   using namespace std;   string s;   int n, a, b, ans, nr1, nr0, minD;   int main() {     cin >> n >> a >> b;     cin >> s;     a--;     b--;     minD = (int)1e8;     nr1 = (int)1e8;     nr0 = (int)1e8;     for (int i = 0; i < s.size(); i++) {       if (s[i] == s[a]) {         nr1 = i;         if (abs(nr1 - nr0) < minD) minD = abs(nr1 - nr0);       }       if (s[i] == s[b]) {         nr0 = i;         if (abs(nr0 - nr1) < minD) minD = abs(nr0 - nr1);       }     }     cout << minD;     return 0;   }   