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#include <iostream>
#include <fstream>
#include <string.h>
#include <math.h>
using namespace std;
ifstream input("cifra.in");
ofstream output("cifra.out");
int main()
{
int s=0,v[105],T;
char c[105];
v[0]=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;
}
input>>T;
for(int i=0; i<T; i++)
{
input>>c;
if (strlen(c)<2)
output<<v[(int)c[0]-48]<<"\n";
else
output<<v[((int)c[strlen(c)-1]-'0')+(((int)c[strlen(c)-2]-'0')*10)]<<"\n";
}
return 0;
}