#include <fstream>
#include <string.h>
using namespace std;
ifstream fin ("cifra.in");
ofstream fout ("cifra.out");
char v[110];
int m[101],i,x,u,pu,j,a,t;
int main () {

    for (i=1;i<=100;i++) {
        a=1;
        for (j=1;j<=i;j++)
            a*=i%10;
        m[i]=(m[i-1]+a)%10;
    }
    fin>>t;

    for (i=1;i<=t;i++){
        fin>>v;
        x=strlen(v);
        u=v[x-1]-'0';pu=v[x-2]-'0';
        if (x==1)
            fout<<m[u]<<'\n';
        else
            fout<<m[pu*10+u]<<'\n';
    }


    return 0;
}