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: while True:

    #strings1 = []
    #strings2 = []

    k1 = []
    g1 = []
    k2 = []
    g2 = []
    check=input()
    if check == ".":
        break
    strings1 = list(map(str, check.split('"')))

    strings2 = list(map(str, input().split('"')))

    nagasa1 = len(strings1)
    nagasa2 = len(strings2)

    for i in range(nagasa1):
        if i % 2 == 0:
            g1.append(strings1[i])
        else:
            k1.append(strings1[i])

    for i in range(nagasa2):
        if i % 2 == 0:
            g2.append(strings2[i])
        else:
            k2.append(strings2[i])

    lengthk1 = len(k1)
    lengthg1 = len(g1)
    lengthk2 = len(k2)
    lengthg2 = len(g2)

    points = 0

    if lengthg1 == lengthg2:
        for i in range(lengthg1):
            if g1[i] == g2[i]:
                pass
            else:
                points += 2
    else:
        points += 2

    if lengthk1 == lengthk2:
        for i in range(lengthk1):
            if k1[i] == k2[i]:
                pass
            else:
                points += 1
    else:
        if lengthk1 - lengthk2 == 1 or lengthk1 - lengthk2 == -1:
            if lengthk1 < lengthk2:
                for i in range(lengthk1):
                    if k1[i] == k2[i]:
                        pass
                    else:
                        points += 1
            else:
                for i in range(lengthk2):
                    if k1[i] == k2[i]:
                        pass
                    else:
                        points += 1
        else:
            points += 2

    if points==0:
        print("IDENTICAL")
    elif points==1:
        print("CLOSE")
    else:
        print("DIFFERENT")

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: 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:
				if i%2==1:
					cnt+=1
				else:
					cnt+=2
		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: results=[]
while True:
    a=list(input())
    if a[0]==".":
        break
    b=list(input())
    count=0
    for i,j in zip(a,b):
        if(a!=b):
            count+=1
    if count==0:
        results.append(0)
    elif count==1:
        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")

Python: while 1:
    list1=input().split('"')
    if list1[0]==".":
        break
    list2=input().split('"')
     
    cnt1=0
    cnt2=0
    flag=0
     
    if len(list1)!=len(list2):
        print("DIFFERENT")
    else:
        i=0
        while i<len(list1):
            if list1[i]==list2[i]:
                cnt1+=1
            elif i%2==0:	#「""の間で」の意味
                print("DIFFERENT")
                flag=1
                break
            else:
                cnt2+=1
                if cnt2>1:
                    print("DIFFERENT")
                    break
            i+=1
                 
        if flag==0 and cnt2==1:
            print("CLOSE")
        if cnt1==len(list1):
            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")