ICPC2017B.cpp

#include <iostream>
#include <string>
using namespace std;

int main() {
  string s1, s2;
  while (cin >> s1, s1 != ".") {
    cin >> s2;

    if (s1[s1.size() - 1] != s2[s2.size() - 1]) {
      cout << "DIFFERENT" << endl;
      continue;
    }

    int q1 = 0;
    for (int i = 0; i < s1.size(); i++) {
      if (s1[i] == '"') {
        q1++;
      }
    }
    int q2 = 0;
    for (int i = 0; i < s2.size(); i++) {
      if (s2[i] == '"') {
        q2++;
      }
    }

    if (q1 != q2) {
      cout << "DIFFERENT" << endl;
      continue;
    }

    int dif = 0;

    int i = 0;
    int j = 0;
    while (i < s1.size() && j < s2.size()) {
      if (s1[i] != s2[j]) {
        dif = 2;
        break;
      }

      if (s1[i] == '"') {
        i++;
        string sc1;
        while (s1[i] != '"') {
          sc1 += s1[i];
          i++;
        }

        j++;
        string sc2;
        while (s2[j] != '"') {
          sc2 += s2[j];
          j++;
        }

        if (sc1 != sc2) {
          dif++;
        }
      }

      i++;
      j++;
    }

    if (dif == 0) {
      cout << "IDENTICAL" << endl;
    } else if (dif == 1) {
      cout << "CLOSE" << endl;
    } else {
      cout << "DIFFERENT" << endl;
    }
  }
  return 0;
}