func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m, a;     cin >> n >> m;     int l = 0, r = n + 1;     string s, s1;     for (int i = 0; i < m; i++) {       cin >> s >> s >> s1 >> s >> a;       if (s1[0] ==  r )         l = max(l, a);       else         r = min(a, r);     }     int ans = r - l - 1;     if (ans <= 0)       cout << -1 << endl;     else       cout << ans << endl;     return 0;   }   