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)
}

Python: while True:
    s1 = input()
    if s1 == '.':
        break
    s2 = input()

    if s1 == s2:
        print("IDENTICAL")
        continue

    s2 = s2.split('"')
    s1 = s1.split('"')
    # print(s1)
    # print(s2)
    count = 0
    isTmp = False
    if s1[0] == '"' and s2[0] == '"':
        isTmp = True

    for i in range(len(s1)):
        if len(s1) != len(s2):
            print("DIFFERENT")
            break
        if count > 1:
            print("DIFFERENT")
            break

        if not isTmp:
            if i % 2 == 0:
                if s1[i] != s2[i]:
                    print("DIFFERENT");
                    break
            if i % 2 == 1:
                if s1[i] != s2[i]:
                    count += 1
        else:
            if i+1 % 2 == 0:
                if s1[i] != s2[i]:
                    print("DIFFERENT");
                    break
            if i+1 % 2 == 1:
                if s1[i] != s2[i]:
                    count += 1

    if count == 1:
        print("CLOSE")

Python: #-*- coding:utf-8 -*-

ans=[]

while True:
    s1=input()
    if s1==".":
        break
    s2=input()

    if(s1==s2):
        ans.append("IDENTICAL")
        continue

    if(len(s1)>len(s2)):
        size=len(s1)
    else:
        size=len(s2)

    cnt=0
    d1=0
    d2=0
    for i in range(size):
        if i+d1>len(s1)-1 or i+d2>len(s2)-1:
            break
        if s1[i+d1]!=s2[i+d2]:
            ans.append("DIFFERENT")
            break
        if len(s1)==1 or len(s2)==1:
            ans.append("DIFFERENT")
            break
        if s1[i+d1]=="\"":
            a1=""
            a2=""
            d1+=1
            d2+=1
            flag=False
            while True:
                if i+d1>=len(s1)-1:
                    ans.append("DIFFERENT")
                    flag=True
                    break
                if s1[i+d1] =="\"":
                    break
                a1=a1+s1[i+d1]
                d1+=1
            while True:
                if i+d1==len(s1)-1:
                    break
                if i+d2==len(s2)-1:
                    ans.append("DIFFERENT")
                    flag=True
                    break
                if s2[i+d2]=="\"" or i+d1>=len(s1)-1 or i+d2>=len(s2)-1:
                    break
                a2=a2+s2[i+d2]
                d2+=1
            if a1!=a2:
                cnt+=1
    if cnt==1:
        ans.append("CLOSE")
    elif cnt>1 and  not flag:
        ans.append("DIFFERENT")
            
for i in ans:
    print(i)

Python: while 1:
	s1=input().split('"')
	if s1[0]==".":
		break
	s2=input().split('"')
	
	cnt1=0
	cnt2=0
	
	if len(s1)!=len(s2):
		print("DIFFERENT")
	else:
		i=0
		while i<len(s1):
			if s1[i]==s2[i]:
				cnt1+=1
			elif i%2==0:
				print("DIFFERENT")
				break
			else:
				cnt2+=1
				if cnt2>1:
					print("DIFFERENT")
					break
			i+=1
				
		if cnt2==1:
			print("CLOSE")
		elif cnt1==len(s1):
			print("IDENTICAL")

Python: while(1):
    a = input()
    if(a == '.'):
        break
    b = input()
    n = len(a)
    m = len(b)
    l = 0;
    flag = 0
    idx_dif = 0
    error_cou = 0

    while(1):
        if(l >= n-1 or l+idx_dif >= m-1):
            flag = 2

        if(flag == 0):
            for i in range(l,n):
                if(a[i] == '\"'):
                    if(i+idx_dif < m and a[l:i] == b[l+idx_dif:i+idx_dif]):
                        l = i+1
                        flag = 1
                    else:
                        flag = 2
                    break

                elif(i == n-1):
                    if(a[l:i] != b[l+idx_dif:m-1]):
                        flag = 2
                    else:
                        l = n-1
                    break
                if(flag != 0):
                    break

        elif(flag == 1):
            for i in range(l,n):
                if(a[i] == '\"'):
                    for j in range(l+idx_dif,m):
                        if(b[j] == '\"'):
                            if(a[l:i] != b[l+idx_dif:j]):
                                error_cou += 1
                            idx_dif = j-i
                            l = i+1
                            flag = 0
                            break
                        if(j == m-1):
                            flag = 2
                            break

                if(flag != 1):
                    break

        if(flag == 2 or l >= n-1 or l+idx_dif >= m-1):
            break

    if(error_cou >= 2 or flag == 2):
        print("DIFFERENT")
    elif(error_cou == 1):
        print("CLOSE")
    elif(error_cou == 0):
        print("IDENTICAL")

Python: results=[]
while True:
    a=input().split("\"")
    if a[0]==".":
        break
    b=input().split("\"")
    count1=0
    count2=0
    if len(a) != len(b):
        results.append(2)
    else:
        for i in range(len(a)):
            if(i%2==1):
                for k,l in zip(a[i],b[i]):
                    if(k!=l):
                        count1+=1
            else:
                for k,l in zip(a[i],b[i]):
                    if(k!=l):
                        count2+=1
        if count1==0 and count2==0:
            results.append(0)
        elif count1==1 and count2==0:
            results.append(1)
        else:
            results.append(2)
for i in results:
    if i==0:
        print("IDENTICAL")
    if i==1:
        print("CLOSE")
    if i==2:
        print("DIFFERENT")