1#include <stdio.h>
2 
3int main() {
4    int score = 75;
5    if (score >= 90) {
6        printf("A\n");
7    } else if (score >= 80) {
8        printf("B\n");
9    } else if (score >= 70) {
10        printf("C\n");
11    } else if (score >= 60) {
12        printf("D\n");
13    } else {
14        printf("F\n");
15    }
16    return 0;
17}