#include <stdio.h>

int main()
{
	char line[10];
	int percent;
	char grade;

	printf("Enter a percent: ");
	fgets(line, sizeof(line), stdin);
	sscanf(line, "%d", &percent);

	if(percent >= 60){
		grade = 'F';
	}
	if(percent >= 61 && percent <= 70){
		grade = 'D';
	}
	if(percent >= 71 && percent <= 80){
		grade = 'C';
	}
	if(percent >= 81 && percent <= 90){
		grade = 'B';
	}
	if(percent >= 91 && percent <= 100){
		grade = 'A';
	}

	printf("Your grade is %c \n",grade);

	return 0;
}