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

int v[101]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0,0};

int main()
{
    int i,j;
    FILE *f=fopen("cifra.in","r");
    FILE *fp=fopen("cifra.out","w");
    int T,x,size;
    char c;
    char s[101];

    fscanf(f,"%d",&T);

       /* for(i=1;i<=100;i++)
        {
            P=1;
            for(j=1;j<=i;j++) P=(P*i)%10;
            S=(S+P)%10;
            v[i]=S;
            fprintf(fp,"%d,",v[i]);
        }
        v[0]=v[100];
*/


    for(i=0;i<T;i++)
    {
        fscanf(f,"%s100",s);
        size=strlen(s);

        if(size>1)
        fprintf(fp,"%d\n",v[(s[size-2]-'0')*10+s[size-1]-'0']);
        else
        fprintf(fp,"%d\n",v[s[size-1]-'0']);
    }

    return 0;
}