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#include <iostream>
#include <fstream>
#include <math.h>
#include <string.h>
using namespace std;
int main()
{ifstream f("cifra.in");
ofstream g("cifra.out");
char n[101];
long t,s,i,j,k,p;
f>>t; s=0;
for (i=1; i<=t; i++)
{
f>>n;f.get();
s=0;
int n1=n[strlen(n)-1]-48;
for (j=1; j<=n1; j++)
{for (k=1; k<=j; k++)
p=(p*j)%10;}
s=(s+p)%10;
g<<s<<'\n';
}
f.close(); g.close();
return 0;
}