#include <iostream>
#include <vector>
using namespace std;
int main(){
vector<int> t(4);
bool cresc = true, desc = true, constant = true;
cin >> t[0] >> t[1] >> t[2] >> t[3];
for (int i = 1; i < 4; i ++) {
cresc &= t[i-1] >= t[i];
desc &= t[i-1] <= t[i];
constant &= t[i-1] == t[i];
}
if (constant || !cresc && !desc) {
cout << "Nemonoton";
}
else if (cresc) {
cout << "Crescator";
} else {
cout << "Descrescator";
}
}
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