#include <iostream>
#include <sstream>
#include <iomanip>

using namespace std;

char A[5];

int conv(){
    unsigned int B = 0;

    for(int i = 4, j = 0; i >= 0; i--, j++){
        unsigned int byte = 0;
        if(A[i]>='a' && A[i]<='f') byte = (10+A[i]-'a');
        else byte = (A[i]-'0');
        B |= (byte << (j*4));
    }
    return B;
}

int main()
{
    cin.tie(0);
    ios_base::sync_with_stdio(false);
    unsigned int B = 0;
    while(1){
        for(int i = 0; i < 5; i++){
            cin >> A[i];
            if(A[i] == '.')goto printres;
        }

        B^=conv();
    }
    printres:;
    std::stringstream sstream;
    sstream << std::hex << B;
    std::string result = sstream.str();
    cout.fill('0');
    cout << setw(5) << result << endl;
}