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#include <bits/stdc++.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int t,n,a[105],x;
char s[105];
int main()
{
f>>t;
f.get();
for(int i=1;i<=99;i++)
{
x=i%10;
for(int j=1;j<i;++j)
x*=i,x%=10;
a[i]=(a[i-1]+x)%10;
}
for(int i=1;i<=t;i++)
{
f.getline(s,105);
n=s[strlen(s)-1]-'0';
if(strlen(s)>1)
n+=(s[strlen(s)-2]-'0')*10;
g<<a[n]<<'\n';
}
return 0;
}