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#include<bits/stdc++.h>
using namespace std;
int v[101];
int ultimulKandeu(int k)
{
int p=1;
for(int i=1;i<=k;++i)
p=(p*k)%10;
return p;
}
void kandeu()
{
for(int i=1;i<100;++i)
{
v[i]=(v[i-1]+ultimulKandeu(i))%10;
}
}
int main()
{
ifstream f("cifra.in");
ofstream g("cifra.out");
kandeu();
char ka[101],c;
int t;
int nr=0;
f>>t;
for(int i=1;i<=t;++i)
{
f.get(c);
f.get(ka,101);
if(strlen(ka)==1)
nr=ka[strlen(ka)-1]-'0';
else
nr=(ka[strlen(ka)-1]-'0')+(ka[strlen(ka)-2]-'0')*10;
g<<v[nr]<<'\n';
}
}