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//============================================================================
// Name : Cifra.cpp
// Author : Lucian
// Version :
// Copyright : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================
#include <fstream>
#include <string.h>
using namespace std;
int main() {
ifstream f("cifra.in");
ofstream g("cifra.out");
int t;
f>>t;
int i;
for(i=1;i<=t;i++)
{
char z[101],u[3];
f>>z;
int len = strlen(z);
if(len>1)
u[0]=z[len-2];
else
u[0]='0';
u[1]=z[len-1];
int x1,x2,num;
x1 = u[0] - '0';
x2 = u[1] - '0';
num = x1*10 + x2;
int v[20] = {0,1,4,7,6,5,6,3,6,9,0,1,6,3,6,5,6,7,4,9};
int w[100],j,k=0;
for (j=0;j<100;j++)
{
k+=v[j % 20];
w[j] = k;
}
g<<w[num]%10<<'\n';
}
f.close();
g.close();
return 0;
}