func_code_string: #include <bits/stdc++.h>   const char nl =   n ;   const int mod = (int)1e9 + 7;   int main() {     std::cin.tie(0)->std::ios::sync_with_stdio(0);     std::cin.exceptions(std::cin.failbit);     int t;     std::cin >> t;     while (t--) {       int n;       std::string s;       std::cin >> n >> s;       int l = -1, r = -1;       for (int i = 0; i < n - 1; i++) {         if ((s[i] ==  a  && s[i + 1] ==  b ) ||             (s[i] ==  b  && s[i + 1] ==  a )) {           l = i + 1;           r = i + 2;           break;         }       }       std::cout << l <<     << r << nl;     }   }   