Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	io := NewIo()
	defer io.Flush()
	for {
		s := io.NextLine()
		if s == "." {
			break
		}
		t := io.NextLine()
		if s == t {
			io.Println("IDENTICAL")
			continue
		}
		ss := strings.Split(s, "\"")
		tt := strings.Split(t, "\"")
		if len(ss) != len(tt) {
			io.Println("DIFFERENT")
			continue
		}
		cnt := 0
		for i := 0; i < len(ss); i++ {
			if i%2 == 0 {
				if ss[i] != tt[i] {
					cnt = -1
					break
				}
			} else {
				if ss[i] != tt[i] {
					cnt++
				}
			}
		}
		if cnt > 1 || cnt == -1 {
			io.Println("DIFFERENT")
		} else {
			io.Println("CLOSE")
		}
	}
}

// I/O template
type Io struct {
	reader    *bufio.Reader
	writer    *bufio.Writer
	tokens    []string
	nextToken int
}

func NewIo() *Io {
	return &Io{
		reader: bufio.NewReader(os.Stdin),
		writer: bufio.NewWriter(os.Stdout),
	}
}

func (io *Io) Flush() {
	err := io.writer.Flush()
	if err != nil {
		panic(err)
	}
}

func (io *Io) NextLine() string {
	var buff []byte
	for {
		line, isPrefix, err := io.reader.ReadLine()
		if err != nil {
			panic(err)
		}
		buff = append(buff, line...)
		if !isPrefix {
			break
		}
	}
	return string(buff)
}

func (io *Io) Next() string {
	for io.nextToken >= len(io.tokens) {
		line := io.NextLine()
		io.tokens = strings.Fields(line)
		io.nextToken = 0
	}
	s := io.tokens[io.nextToken]
	io.nextToken++
	return s
}

func (io *Io) NextInt() int {
	i, err := strconv.Atoi(io.Next())
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) NextFloat() float64 {
	i, err := strconv.ParseFloat(io.Next(), 64)
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) Println(a ...interface{}) {
	fmt.Fprintln(io.writer, a...)
}

func (io *Io) Printf(format string, a ...interface{}) {
	fmt.Fprintf(io.writer, format, a...)
}

func (io *Io) PrintIntSlice(a []int) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func (io *Io) PrintStringSlice(a []string) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func Log(name string, value interface{}) {
	fmt.Fprintf(os.Stderr, "%s=%+v\n", name, value)
}

func ExampleIo() {
	io := NewIo()
	defer io.Flush()
	a := make([]int, 0, 3)
	a[0], a[1], a[2] = io.NextInt(), io.NextInt(), io.NextInt()
	io.Println(a)
	io.PrintIntSlice(a)
	Log("io", a)
}

C++: #include<iostream>
using namespace std;

int main(){
	while(true){
		char s1[200], s2[200];
		cin >> s1;
		if(s1[0] == '.' && s1[1] == '\0'){
			break;
		}
		cin >> s2;
		bool isClose = false, isDifferent = false;
		bool isInsideBlock = false;
		int s1Offset = 0, s2Offset = 0;
		for(int i = 0; i < 200; i++){
			if(isInsideBlock){
				if(s1[i + s1Offset] != s2[i + s2Offset]){
					isDifferent = true;
					break;
				}else if(s1[i + s1Offset] == '"'){
					isInsideBlock = true;
				}
			}else{
				if(s1[i + s1Offset] != s2[i + s2Offset]){
					if(isClose){
						isDifferent = true;
					}else{
						isClose = true;
						while(s1[i + s1Offset] == '"'){
							s1Offset++;
						}
						while(s2[i + s2Offset] == '"'){
							s2Offset++;
						}
					}
				}else if(s1[i + s1Offset] == '"'){
					isInsideBlock = false;
				}
			}
		}
		if(s1[i + s1Offset] == '\0' && s2[i + s1Offset] == '\0'){
			break;
		}
	}
	return 0;
}

C++: #include<iostream>

using namespace std;

int main(){

  char s1[200]={0};
  char s2[200]={0};
  char t1[200]={0};
  char t2[200]={0};
  char u1[200]={0};
  char u2[200]={0};

  int c=0,flag=0,j=0,k=0,l=0;

  for(int x=0;x<100;x++){


  cin>>s1;
  if(s1[0]=='.') break;               //input
  cin>>s2;


  for(int i=0;i<200;i++){           
    if(s1[i]=='"'){
      if(flag==0){
	flag=1;
	
      }else if(flag==1){
	flag=0;
	
      }
    }

    if(flag==1){                   //copy to u
      t1[j]=s1[i];
      j++;    
    }

    if(flag==0){                 //copy to t
      u1[l]=s1[i];
      l++;    
    }


  }
  j=0;
  l=0;
  flag=0;

  for(int i=0;i<200;i++){             

    if(s2[i]=='"'){
      if(flag==0){
	flag=1;
	
      }else if(flag==1){
	flag=0;
	
      }
    }

    if(flag==1){                       //copy to t

      t2[j]=s2[i];
      j++;
    }

 if(flag==0){                            //copy to u
      u2[l]=s2[i];
      l++;
    }

  }
 j=0;
 l=0;
 flag=0;

 
   
 for(int i=0;i<150;i++){           //check in " "


    if(flag==1){
    if(t1[j]!=t2[k]){
      c++;
      flag=0;
    }

    if(t1[j]=='"' && t2[k]!='"'){
      j--;
    }
    if(t2[k]=='"' && t1[j]!='"'){
      k--;
    }

    j++;
    k++;

    }

   if(t1[j]=='"' && t2[k]=='"'){
     flag=1;

    }


  }

    j=0;
    k=0;
    l=0;
    flag=0;


 for(int i=0;i<200;i++){               //check out " "
    if(u1[i]!=u2[i]){
      c=2;
    }
  }

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

    c=0;

   
    /*   cout<<t1<<endl;
    cout<<t2<<endl;
    cout<<u1<<endl;
    cout<<u2<<endl;*/
    for(int i=0;i<200;i++){
     s1[i]=0;
    s2[i]=0;
    t1[i]=0;
    t2[i]=0;
    u1[i]=0;
    u2[i]=0;
    }

  }

  return 0;
}

C++: #include<iostream>
#include<string>
using namespace std;

	
int main(){
	while(true){


	string s1;
	cin>>s1;
	
	if(s1=="."){
		break;
	}

	string s2;
	cin>>s2;
	
	if(s1==s2){
		cout<<"IDENTICAL"<<endl;
		continue;
	}

	string t1=s1;
	string t2=s2;
	
	while(true){
		size_t d1b =t1.find('\"');
		if(d1b==string::npos)
			break;
		
		t1.replace(d1b,1,"@");
		
		size_t d1e=t1.find('\"');
		t1.replace(d1e,1,"@");		

		size_t d2b =t2.find('\"');
		if(d2b==string::npos)
			break;
		t2.replace(d2b,1,"@");
		
		size_t d2e=t2.find('\"');
		t2.replace(d2e,1,"@");

		string u1=s1;
		u1.replace(d1b+1,d1e-d1b-1,"");
		string u2=s2;
		u2.replace(d2b+1,d2e-d2b-1,"");
		
		if(u1==u2){
			t1=u1;
			t2=u2;
			break;
		}
	}
	if(t1==t2){
		cout<<"CLOSE"<<endl;
	}else{
		cout<<"DIFFERENT"<<endl;
	}
	}
return 0;
}

C++: #include <bits/stdc++.h>
#define MOD 1000000007
typedef long long ll;
using namespace std;

string S,T;

void solve(){
  if(S==T){
    cout<<"IDENTICAL"<<endl;
    return;
  }

  vector<string> a,b;
  vector<string> x,y;
  bool flag=false;
  string tmp;
  string rest="";
  for(int i=0;i<S.size();i++){
    if(S[i]=='"'){
      if(flag){
        flag=false;
        a.push_back(tmp);
      }else{
        flag=true;
        tmp="";
        x.push_back(rest);
        rest="";
      }
    }else if(flag) tmp+=S[i];
    else rest+=S[i];
  }
  if(rest!="") x.push_back(rest);

  flag=false;
  rest="";
  for(int i=0;i<T.size();i++){
    if(T[i]=='"'){
      if(flag){
        flag=false;
        b.push_back(tmp);
      }else{
        flag=true;
        tmp="";
        y.push_back(rest);
        rest="";
      }
    }else if(flag) tmp+=T[i];
    else rest+=T[i];
  }
  if(rest!="") y.push_back(rest);

  if(a.size()==b.size()){
    bool ok=true;
    for(int i=0;i<a.size();i++){
      if(a[i]==b[i]) continue;
      else{
        if(ok) ok=false;
        else{
          cout<<"DIFFERENT"<<endl;
          return;
        }
      }
    }

    bool close=false;
    if(x.size()==y.size()){
      close=true;
      for(int i=0;i<x.size();i++){
        if(x[i]==y[i]) continue;
        else close=false;
      }
    }

    if(close){
      cout<<"CLOSE"<<endl;
      return;
    }
  }

  cout<<"DIFFERENT"<<endl;
}

int main(){
  while(1){
    cin>>S;
    if(S==".") break;
    cin>>T;
    solve();
  }

  return 0;
}