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#include <fstream>
#include <string.h>
using namespace std;
int b[101];
void c()
{
for(int i=1;i<=100;i++)
{
int s=0;
for(int j=1;j<=i;j++)
{
int p=1;
for(int k=1;k<=j;k++)
{
p*=j;
p%=10;
}
s=s+p;
s%=10;
}
b[i]=s;
}
}
int main()
{
ifstream f("cifra.in");ofstream g("cifra.out");
char a[101];
int T;f>>T;
f.get();
c();
for(int i=1;i<=T;i++)
{
f>>a;int nr;
if(strlen(a)>1) nr = (a[strlen(a)-2]-'0')*10 + (a[strlen(a)-1]-'0');
else nr = a[strlen(a)-1]-'0';
g<<b[nr]<<endl;
}
return 0;
}