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#include <algorithm>
#include <iterator>
#include <iostream>
using namespace std;

int main() {
	int i=0;
	copy_if(
		istream_iterator<char>(cin>>noskipws),
		istream_iterator<char>(),
		ostream_iterator<char>(cout),
		[&i](const char &ch) {return (++i)%2;}
		);
	cout<<endl;
	return 0;
}

// https://paiza.jp/poh/enshura-second/8e09c5dc