4

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define pb push_back
typedef long long ll;
#define db(x) cerr<<__LINE__<<": "<<#x<<" = "<<(x)<<'\n'
const int inf = 1e9+7;
const int N = 1e6+9;

int main() {
    ios_base::sync_with_stdio(0);
    int A[5];
    for(int i=0;i<4;++i) {
        cin>>A[i];
    }
    sort(A, A+4);
    int s=0;
    for(int i=0;i<3;++i) s+=A[i];
    if(s<=A[3]) cout<<"Invalid.";
    else {
        cout<<"valid";
        int p=A[0], rhom=1;
        for(int i=1;i<4;++i) {
            if(A[i]!=p) rhom=0;
        }
        if(rhom) cout<<", rhombus";
        else cout<<".";
    }
    return 0;
}