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#include <fstream>
#include <cstring>
using namespace std;
ifstream f ("cifra.in");
ofstream g ("cifra.out");
char s[103];
int t, n, i, j, a, m[101];
int main ()
{ for (i=1;i<=100;++i)
{ a=1;
for(j=1;j<=i;j++) a=a*i%10;
m[i]=(m[i-1]+a)%10;
}
f>>t;
for(i=1;i<=t;i++)
{ f>>s;
n=strlen(s);
if(n==1) g<<m[s[0]-'0']<<'\n';
else g<<m[(s[n-2]-'0')*10+s[n-1]-'0']<<'\n';
}
g.close();
return 0;
}