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#include <fstream>
#include <cstring>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int t;
char c[105];
int v[105];
int main()
{
f>>t;
int s=0;
for(int i=1;i<=99;i++)
{
int p=1;
int r=i%4;
if(!r) r=4;
for(int j=1;j<=r;j++)
p*=(i%10);
s+=(p%10);
v[i]=s%10;
}
while(t--)
{
f>>c;
int n=strlen(c),u;
n--;
if(n)
u=(c[n-1]-'0')*10+(c[n]-'0');
else u=(c[n]-'0');
g<<v[u]<<'\n';
}
return 0;
}