#include<bits/stdc++.h>
using namespace std;

int sol[]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4};
char s[1005];
int t,n,nr;
int main()
{
    freopen("cifra.in","r",stdin);
    freopen("cifra.out","w",stdout);

    scanf("%d",&t);
    while(t--)
    {
        memset(s,0,sizeof(s));
        scanf("%s",s+1);
        n=strlen(s+1);
        if(n==1)
        {
            printf("%d\n",sol[s[1]-'0']);
        }
            else
        {
            nr=s[n]-'0'+10*s[n-1]-10*'0';
            printf("%d\n",(4*(nr/20)+sol[nr%20])%10);
        }
    }
    return 0;
}