ans

#include<bits/stdc++.h>
#define int long long
using namespace std;
//vector<int> a;
//map<string,int> a;
//priority_queue<int, vector<int>, greater<int> > a;
stack<char> a;
signed main(){
	string s;
	cin>>s;
	for(int i=0;i<s.size();i++){
		if(s[i]=='('||s[i]=='['){
			a.push(s[i]);
		}else if(s[i]==')'){
			if(a.empty()||a.top()!='('){
				cout<<"Wrong";
				return 0;
			}
			a.pop();
		}else if(s[i]==']'){
			if(a.empty()||a.top()!='['){
				cout<<"Wrong";
				return 0;
			}
			a.pop();
		}
	}
	if(a.empty()){
		cout<<"OK";	
	}else{
		cout<<"Wrong";
	}
	return 0;
}