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#include<fstream>
#include<cstring>
using namespace std;
ifstream f("cifra.in"); ofstream g("cifra.out");
int t,v[101];
int main()
{ for(int i=1; i<=100; ++i)
{ int pow=i;
for(int j=1; j<i; ++j) pow=(pow*i)%10;
v[i]=(v[i-1]+pow)%10;
}
f>>t;
char n[102];
while(t--)
{ f>>n+1;
int x,lg=strlen(n+1);
x=(lg>1 ? (n[lg-1]-'0')*10+n[lg]-'0' : n[lg]-'0');
g<<v[x]<<'\n';
}
g.close(); return 0;
}