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#include <iostream>
#include<fstream>
#include<math.h>
#include<string.h>
using namespace std;
ifstream f;
ofstream g;
int t,i,j,a[100];
char c[100];
int main()
{
f.open("cifra.in");
g.open("cifra.out");
f>>t;
a[0]=0;
for(i=1;i<100;i++)
{
if(i%10){
if(i%4)a[i]=a[i-1]+pow(i%10,i%4);
else
a[i]=a[i-1]+pow(i%10,2);
}
else a[i]=a[i-1];
a[i]%=10;
}
while(t>0)
{
f>>c;
i=strlen(c);
if(i>=2)g<<a[(c[i-2]-'0')*10+(c[i-1]-'0')]<<'\n';
else g<<a[c[i-1]-'0']<<'\n';
t--;
}
g.close();
}