#include<iostream>
using namespace std;
 
 
int convertNum(int n){
 
int digits=0;
int remainder;
 
 
for(int i=n;n!=0;n/=10)
digits=digits+1;
 
 
 
 
for(int j=1;j<=digits;j++){
n=n/10;
remainder=n%10;
if(remainder==2)
  remainder=2;
if(remainder!=2)
  remainder=0;
 
}
 
return remainder;
 
 
}
 
 
 
int main()
{
 int a;
 
 cout<<"Please enter a positive integer"<<endl;
 cin>>a;
 
cout<<"The converted version of "<<a<<" is ----> "<<convertNum(a);
 
 
return 0;
}

 
string convertNum(string num)
{
 //1.set counter to 0
 //2.Check if it is the end of the string(using counter's position).
 // 3.if yes goto goto step 4 
 //   else check if the character in the string is other than 2 
//    if yes, fill  a zero in the string
//increment the counter
// goto step 2 
//4.Display or return your string
 
}