#include <stdio.h>

int score;
char rank;

void main()
{

scanf("%d", &score);
if (score >= 90)

rank = 'A';

else if (score >= 80)

rank = 'B';

else if (score >= 70)

rank = 'C';

else if (score >= 60)

rank = 'D';

else

rank = 'F';

printf("The rank of %d is %c.\n", score, rank);

}

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