#include <cstdio>
#include <cstring>
using namespace std;
int v[120];
char s[120];
int main()
{
    freopen("cifra.in","r",stdin);
    freopen("cifra.out","w",stdout);
    int i,put,curent;
    for(i=1; i<=100; i++)
    {
        put=i%4;
        if(!put)
            put=4;
        curent=1;
        for(int j=1; j<=put; j++)
            curent=(curent*i)%10;
        v[i]=(v[i-1]+curent)%10;
    }
    int t,n,temp;
    scanf("%d\n",&t);
    for(i=1; i<=t; i++)
    {
        gets(s+1);
        scanf("\n");
        n=strlen(s+1);
        temp=s[n]-'0'+s[n-1]-'0';
        printf("%d\n",v[temp]);
    }
    return 0;
}