#include<bits/stdc++.h>
using namespace std;
 
int main(){
string s,s2,s1[100]={"0000","0001","0010","0011","0100","0101","0110","0111","1000","1001","1010","1011","1100","1101","1110","1111"};
    cin>>s;
    for(int i=0;i<s.size();i++){
        if(s[i]>='A'&&s[i]<='Z'){
            s2=s2+s1[s[i]-55];
        }
        else s2=s2+s1[s[i]-48];
    }
    while(s2[0]=='0'){
        s2.erase(0,1); 
    }
    if(s2==""){
        cout<<"0";
    }else{
        cout<<s2;
    }
}
 
/**************************************************************
	Problem: 1306
	User: jiangyuanfeng
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2080 kb
****************************************************************/