#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main(){
string s;
cin >> s;
vector<int> arr(s.size());
int j = 0;
for(auto ch : s){
if (ch >= '0' && ch <= '9') {
arr[j] = ch - '0';
++j;
} else {
cerr << "Bad input: " << ch << endl;
}
}
for(int i = 0; i < j; ++i)
cout << arr[i];
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8c3RyaW5nPgojaW5jbHVkZSA8dmVjdG9yPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKXsKICAgIHN0cmluZyBzOwogICAgY2luID4+IHM7CiAgICB2ZWN0b3I8aW50PiBhcnIocy5zaXplKCkpOwogICAgaW50IGogPSAwOwogICAgZm9yKGF1dG8gY2ggOiBzKXsKCQlpZiAoY2ggPj0gJzAnICYmIGNoIDw9ICc5JykgewogICAgICAgIAlhcnJbal0gPSBjaCAtICcwJzsKICAgICAgICAJKytqOwoJCX0gZWxzZSB7CgkJCWNlcnIgPDwgIkJhZCBpbnB1dDogIiA8PCBjaCA8PCBlbmRsOwoJCX0KICAgIH0KICAgIGZvcihpbnQgaSA9IDA7IGkgPCBqOyArK2kpCiAgICAJY291dCA8PCBhcnJbaV07Cn0=