nyoj-991-Registration system

#include<stdio.h>
#include<string.h>
char a[107][1005];
int b[107];
int main()
{
    int n;
    while(scanf("%d",&n)!=EOF)
    {
        int i,j;
        memset(b,0,sizeof(b));
        scanf("%s",a[0]);
        printf("OK\n");
        for(i=1;i<n;i++)
        {
            scanf("%s",a[i]);
            for(j=0;j<i;j++)
            if(strcmp(a[j],a[i])==0)
            {
                printf("%s%d\n",a[i],++b[j]);
                break;
            }
            if(j==i) printf("OK\n");
        }
    }
    return 0;
}