func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     cin >> n >> m;     string s;     int a;     int x = 0, y = n + 1;     for (int i = 0; i < m; i++) {       cin >> s;       cin >> s;       cin >> s;       if (s[0] ==  r ) {         cin >> s;         cin >> a;         if (a > x) x = a;       } else {         cin >> s;         cin >> a;         if (a < y) y = a;       }     }     if (y - x <= 1 || x == n || y == 1)       cout << -1;     else       cout << y - x - 1;     return 0;   }   