文件目录

#include <bits/stdc++.h>
using namespace std;
string s;
bool pd(string s){
    stack<char> c;
    for(int i=0;s[i];i++){
        if(s[i]=='('||s[i]=='[') c.push(s[i]);
        else if(s[i]==')'||s[i]==']'){
            if(c.empty()||
                c.top()=='('&&s[i]==']'||
                c.top()=='['&&s[i]==')') 
                return false;
            else c.pop(); 
        }
    }
    if(c.empty()) return true;
    else return false;
}
int main(){
    cin>>s;
    if(pd(s)) cout<<"OK";
    else cout<<"Wrong";
    return 0;
}