#include<iostream>
#include<string>
using namespace std;
string X_T(char value);
string T_E(string value);
string getTwo(string data);
string getEight(string data);
int main(int argc,char** argv){
string data;
cin >> data;
cout << getEight(getTwo(data));
return 0;
}
string getTwo(string data){
string resault = "";
int length = data.length();
for(int i = 0;i < length;i++){
resault = resault + X_T(data[i]);
}
return resault;
}
string getEight(string data){
string value = "";
string value_temp = "";
int length_ = data.length();
int length;
if(length_ % 3 == 0){
length = length_ / 3;
}else{
if(length_ % 3 == 1){
data = "00" + data;
}else if(length_ % 3 == 2){
data = "0" + data;
}
length_ = data.length();
length = length_ / 3;
}
for(int i = 0;i < length;i++){
value_temp = "";
value_temp.append(1,data[3 * i]).append(1,data[3 * i + 1]).append(1,data[3 * i + 2]);
value = value + T_E(value_temp);
}
int sign = 0;
string temp = "";
while(value[sign] == '0'){
sign++;
}
for(int i = sign;i < value.length();i++){
temp.append(1,value[i]);
}
return temp;
}
string T_E(string value){
if(value == "000"){
return "0";
}else if(value == "001"){
return "1";
}else if(value == "010"){
return "2";
}else if(value == "011"){
return "3";
}else if(value == "100"){
return "4";
}else if(value == "101"){
return "5";
}else if(value == "110"){
return "6";
}else if(value == "111"){
return "7";
}else{
return "";
}
}
string X_T(char value){
switch(value){
case '0':
return "0000";
break;
case '1':
return "0001";
break;
case '2':
return "0010";
break;
case '3':
return "0011";
break;
case '4':
return "0100";
break;
case '5':
return "0101";
break;
case '6':
return "0110";
break;
case '7':
return "0111";
break;
case '8':
return "1000";
break;
case '9':
return "1001";
break;
case 'A':
return "1010";
break;
case 'B':
return "1011";
break;
case 'C':
return "1100";
break;
case 'D':
return "1101";
break;
case 'E':
return "1110";
break;
case 'F':
return "1111";
break;
}
}