#include <stdio.h>
#include <string.h>

int main()
{
    int i, len, n;
    char re[105], ch[5];
    char a[10] = {'0', 'E', 'I', 'E', 'I', 'E', 'I', 'I'};
    scanf("%d", &n);
    for(i=0;i<n;i++)
    {
        scanf("%s", ch);
        len = strlen(ch);
        if(strcmp(ch, "0")==0) re[i] = 'X';
        else if(len<=2) re[i] = a[ch[0]-'0'];
        else re[i] = 'E';
    }
    for(i=0;i<n;i++)
    {
        if(i==n-1) printf("%c\n", re[i]);
        else printf("%c", re[i]);
    }
    return 0;
}