#include<bits/stdc++.h> using namespace std; int main() { int h,j,k,l; cin>>h>>j>>k>>l; if(h<j&&j<k&&k<l) cout<<"Fish Diving"; else if(h>j&&j>k&&k>l) cout<<"Fish Rising"; else if(h==j&&j==k&&k==l) cout<<"Fish At Constant Depth"; else cout<<"No Fish"; return 0; }