#include <cstdio>
#include <stack>
#include <string.h>

                        using namespace std;

                    int main(){

                    char qwert[10001];


                           while(scanf("%s",qwert) != EOF){

                            stack <int> pilha;

                             bool jujuba = true;

                             for(int i=0 ; i < strlen(qwert) ; i++){

                               if(qwert[i] == '('){
                                        pilha.push(1);
                               }
                                else if(qwert[i] == ')'){

                                        pilha.pop();
                               }

                               if(qwert[i] == ')' && pilha.empty()){

                                        jujuba = false;
                                            printf("correct\n")
                               }

                               else{
                                printf("incorrect\n");
                               }


                             }


                           }


                                    return 0;
                                         }