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(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] == '\"'):
                    for j in range(l+idx_dif,m):
                        if(b[j] == '\"'):
                            if(a[l:i] == b[l+idx_dif:j]):
                                idx_dif = j-i
                                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):
            break
        if(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: A=[]
while True:	
	a=input().split('"')
	if a[0]==".":
		break
	b=input().split('"')
	
	cnt=0

	if len(a)!=len(b):
		A.append(-1)
	else:
		for i in range(len(a)):
			if(a[i]==b[i]):
				pass
			else:
				cnt+=1
		if cnt>=2:
			A.append(-1)
		if cnt==1:
			A.append(0)
		if cnt==0:
			A.append(1)

A.reverse()
#print(A)
for i in range(len(A)):
	tmp=A.pop()
	if tmp==-1:
		print("DIFFERENT")
	elif tmp==0:
		print("CLOSE")
	else:
		print("IDENTICAL")

Python: # from sys import exit

while(True):
    S0 = str(input())
    if S0 == ".":
        exit()
    S1 = str(input())
    if S0 == S1:
        print("IDENTICAL")
        continue
    S0else = list(S0.split('"')[0::2])
    S1else = list(S1.split('"')[0::2])
    if S0else != S1else:
        print("DIFFERENT")
        continue
    S0str = list(S0.split('"')[1::2])
    S1str = list(S1.split('"')[1::2])
    if len(S0str) != len(S1str):
        print(S0str, S1str)
        print("DIFFERENT")
        continue
    OK = 1
    for i in range(len(S0str)):
        if S0str[i] != S1str[i]:
            OK -= 1
    if OK < 0:
        print("DIFFERENT")
    elif OK >= 0:
        print("CLOSE")

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

Python: while 1:
    s = input()
    if s=='.':
        break
    s=list(s.split('"'))
    t=list(input().split('"'))
    if s==t:
        print("IDENTICAL")
    elif len(s)!=len(t):
        print("DIFFERENT")
        continue
    else:
        flag = 0
        for i in range(0,len(s),2):
            if s[i] != t[i]:
                print("DIFFERENT")
                flag = 1
                break
        if flag == 1:
            continue
        for i in range(1,len(s),2):
            if s[i] != t[i]:
                flag+=1
                if flag == 2:
                    print("DIFFERENT")
                    break
        if flag == 1:
            print("CLOSE")

Python: while 1:
    s1 = input().split('\"')
    l1 = len(s1)
    if s1[0] == ".": break
    s2 = input().split('\"')
    l2 = len(s2)
    if l1 != l2:
        print("DIFFERENT")
        continue
    i = 0
    cnt = 0
    while 1:
        if i > l1-2:
            if cnt == 1:
                print("CLOSE")
                break
            else:
                print("IDENTICAL")
                break
        if s1[i] != s2[i]:
            print("DIFFERENT")
            break
        if s1[i+1] != s2[i+1]:
            if cnt == 1:
                print("DIFFERENT")
                break
            else: cnt = 1
        i += 2

Python: while 1:
    s1 = input()
    if s1 == '.': break
    s2 = input()
    S1 = s1.partition('\"')
    S2 = s2.partition('\"')

    jdg = 1
    cnt_d = 0

    if len(S1) != len(S2): print("DIFFERENT")
    else:
        l = len(S1)
        i = 0
        while i < l:
            if S1[i] != S2[i]:
                cnt_d += 1
                if '\"' in S1[i] and '\"' in S2[i]:
                    jdg = 1
                else:
                    jdg = 0
                    break
            i += 1

        if jdg == 1 and cnt_d == 1: print("CLOSE")
        elif jdg == 0 or cnt_d > 1: print("DIFFERENT")
        else: print("IDENTICAL")