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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int v[105];
void generare()
{
v[0]=0;
for(int i=1;i<100;i++)
{
int p=1;
for(int j=1;j<=i;j++)
p=(p*i)%10;
v[i]=(v[i-1]+p)%10;
}
}
int main()
{
int t,n;
generare();
fin>>t;
for(int i=1;i<=t;i++)
{
char s[105];
fin>>s;
if(strlen(s)==1)n=s[0]-'0';
else {
n=(s[strlen(s)-2]-'0')*10;
n+=s[strlen(s)-1]-'0';
}
fout<<v[n]<<'\n';
}
}