#include <stdio.h>
void main()
{
    int score;
    printf("please enter score\n",score);
    scanf("%d",&score);
    if(score>=90)            printf ("score is a%d\n",score);
    if(score>=80&&score<=89) printf ("score is b%d\n",score);
    if(score>=70&&score<=79) printf ("score is c%d\n",score);
    if(score>=60&&score<=69) printf ("score is d%d\n",score);
    if(score <60)            printf ("score is e%d\n",score);
}