func_code_string: #include <bits/stdc++.h>   using namespace std;   bool cmp(int a, int b) { return a > b; }   int main() {     long long n, m, i, j, k, t, a, b;     cin >> a >> b;     m = b - a;     if (m == 0) {       cout << 1 << endl;     } else {       if (m > 4) {         cout << 0 << endl;       } else {         n = 1;         for (i = a + 1; i <= b; i++) {           n = (n % 10 * i % 10) % 10;         }         cout << n << endl;       }     }     return 0;   }   