FAVIU

#include <iostream>
#include <bitset>

using namespace std;

bitset<100>v;

int main()
{
    int  i, len, s = 0;

    cin >> v;

    for(i = 0; i < 100; i++)
    {
        if(v[i] == 1)
        {
            len = i;
        }
    }
    int r = (len+1)%2;
    if(r)
    {
        cout << r;
    }
    for( i = len-r; i > 0; i -= 2)
    {
        cout << v[i-1] + v[i]*2;
    }

    return 0;
}