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#include <fstream>
#include <string.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int i,j,n,s,b,a[105],t,x;
char S[105];
int main()
{ f>>t;
for(i=1;i<=100;i++)
{ b=i;
for(j=1;j<i;j++)
b=(b*i)%10;
s=s+b; s=s%10;
a[i]=s;
}
for(i=1;i<=t;i++)
{ f>>S;
n=strlen(S);
if(n-1>0) x=(S[n-2]-'0')*10+S[n-1]-'0';
else
x=S[n-1]-'0';
g<<a[x]<<'\n';
}
g.close(); return 0;
}