Is (´･_･`((´･_･`)´･_･`)) a copy-and-paste of (´･_･`)?

copipe.cpp

#include <vector>
#include <iostream>

using namespace std;

bool failed = false;
int pos = 0;
string s;
string seq = "ABCDCba";  

void sub(){
  //printf("%d\n",pos);
  if(s[pos] != seq[0]){
    //printf("failed at %d\n",pos);
    failed = true;
    return;
  }
  int c, accum = 0;
  pos++;
  for(int c = 1; c < 7;){
    if(s[pos+accum] == seq[0]){
      pos += accum;
      accum = 0;
      sub();
    }else{
      if(s[pos+accum] == seq[c]){
        c++;
        accum++;
        //printf("%d\n",accum);
      }else{
        failed = true;
        //printf("failed at (%d,%d)\n",pos,c);
        return;
      }
    }
  }
  pos += accum;
  //printf("%d\n",pos);
}

bool run() {
  int len = s.length();
  //printf("%d\n",len);

  do{
    sub();
    //printf("After sub(): %d\n",pos);
  }while(pos < len-1 && !failed);
  return !failed;
}

int main(){
  cin >> s;
  bool r = run();
  if(r){
    puts("YES");
  }else{
    puts("NO");
  }

  return 0;
}