#include <cstdio>
#include <cstring>
using namespace std;
int v[]={0,1,4,7,6,5,6,3,6,9,0,1,6,3,4,5,6,7,4,9};
int v1[105];
char s[200];
void rezolvare()
{
    int n,x;
    gets(s);
    n=strlen(s)-1;
    if(n>=2)
        x=((s[n]-'0')+(s[n-1]-'0')*10+(s[n-2]-'0')*100);
    else
    {
        if(n==1)
            x=(s[n]-'0')+(s[n-1]-'0')*10;
        else
            if(n==0)
                x=(s[n]-'0');
    }
    x=x%100;
    printf("%d\n",v1[x]);
}
int main()
{
    freopen("cifra.in","r",stdin);
    freopen("cifra.out","w",stdout);
    int i,n;
    scanf("%d",&n);
    for(i=1;i<=100;i++)
    {
        v1[i]=(v1[i-1]+v[i%20])%10;
    }
    for(i=1;i<=n;i++)
    {
           rezolvare();
    }
    return 0;
}