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<stdio.h>
#include<string>
#include<vector>
#include<string.h>
using namespace std;
vector<string>vec1;
vector<string>vec2;
char s1[205];
char s2[205];
int main()
{
    scanf("%s\n",s1);
    scanf("%s\n",s2);
    string str="";
    while(s1[0]!='.')
    {
        int num=0;
        str="";
        int len1=strlen(s1);
        int len2=strlen(s2);
        for(int i=0;i<len1;i++)
        {
            if(s1[i]=='"')
            {
                vec1.push_back(str);
                str="";
                i++;
                while(s1[i]!='"')
                {
                    str+=s1[i];
                    i++;
                }
                vec1.push_back(str);
                str="";
            }
            else if(s1[i]==';')
            {
                vec1.push_back(str);
                str="";
            }
            else
            {
                str+=s1[i];
            }
        }
        vec1.push_back(str);
        str="";
        for(int i=0;i<len2;i++)
        {
            if(s2[i]=='"')
            {
                vec2.push_back(str);
                str="";
                i++;
                while(s2[i]!='"')
                {
                    str+=s2[i];
                    i++;
                }
                vec2.push_back(str);
                str="";
            }
            else if(s2[i]==';')
            {
                vec2.push_back(str);
                str="";
            }
            else
            {
                str+=s2[i];
            }
        }
        vec2.push_back(str);
        str="";
        if(vec1.size()!=vec2.size())
            printf("DIFFERENT\n");
        else
        {
            int cnt=vec1.size();
            for(int i=0;i<cnt;i++)
            {
                if(vec1[i]!=vec2[i])
                    num++;
                if(num>=2)
                    break;
            }
            if(num==2)
                printf("DIFFERENT\n");
            else if(num==1)
            {
                printf("CLOSE\n");
            }
            else if(num==0)
            {
                printf("IDENTICAL\n");
            }
        }
        vec1.clear();
        vec2.clear();
        scanf("%s\n",s1);
        scanf("%s\n",s2);
    }
    return 0;
}

C++: #include <stdio.h>
#include <iostream>
#include <vector>
#include <string>
using namespace std;

string s;
string tt;
int ans;
int ff;

int main(){
  cin >> s;
  while(s!="."){
    ans=0;
    ff=0;
    int i=0;
    int j=0;
    cin >> tt;
    for(;i<int(s.size())&&j<int(tt.size());){
      if(s[i]==tt[j]&&s[i]!=0x22&&tt[j]!=0x22){
        ++i;
        ++j;
        continue;
      }
      if(s[i]!=tt[j]){
        ans=1;
        break;
      }
      if(s[i]==0x22&&tt[j]==0x22){
        ++i;
        ++j;
        if(s[i]!=tt[j]){
          ++ff;
        }
        else{
        for(;s[i]!=0x22&&tt[j]!=0x22;){
          if(s[i]!=tt[j]){
            ++ff;
            break;
          }
          ++i;
          ++j;
        }
      }
        while(s[i]!=0x22){
          ++i;
        }
        while(tt[j]!=0x22){
          ++j;
        }
        ++i;
        ++j;
      }

      if(ans==1)break;
    }
    if(i==int(s.size())&&j==int(tt.size())){}
    else{
      ans=1;
    }
    if(ans==1||ff>=2){
      printf("DIFFERENT\n");
    }
    else if(ff==0){
      printf("IDENTICAL\n");
    }
    else{
      printf("CLOSE\n");
    }
    cin >> s;
  }
}