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4949.cpp
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4949.cpp
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#include <iostream>
#include <stack>
#include <string>
using namespace std;
int main(){
while (1){
string input;
getline(cin,input);
stack<char> s;
string result = "yes";
if (input.length()>100) break;
if (input.length() == 1 && input[0]=='.'){
break;
}
else{
for (int i=0; i<input.size(); i++){
if (input[i] == '('){
s.push('(');
}
else if (input[i] == '['){
s.push('[');
}
else if (input[i] == ')'){
if (!s.empty() && s.top() == '('){
s.pop();
}
else{
result = "no";
break;
}
}
else if (input[i] == ']'){
if (!s.empty() && s.top() == '['){
s.pop();
}
else{
result = "no";
break;
}
}
}
}
cout<<result<<endl;
}
}