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: 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):
                if len(a[i]) == len(b[i]):
                    count1+=1
                else:
                    for k,l in zip(a[i],b[i]):
                        if(k!=l):
                            count1+=1
            else:
                if len(a[i]) == len(b[i]):
                    count2+=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")

Python: while 1:
    s1=input().split('"')
    if s1[0]==".":
        break
    s2=input().split('"')
     
    flag2=0
    cnt2=0
    flag=0
     
    if len(s1)!=len(s2):
        print("DIFFERENT")
    else:
        i=0
        while i<len(s1):
            if s1[i]==s2[i]:
                flag2=1
            elif i%2==0:
                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 flag2==1:
            print("IDENTICAL")

Python: while 1:
    a = input()
    if a == ".":
        break
    b = input()
    if a == b:
        print("IDENTICAL")
    else:
        a = a.split("\"")
        b = b.split("\"")
        if len(a) != len(b):
            print("DIFFERENT")
        else:
            key = [0,0]
            for i in range(len(a)):
                if a[i] != b[i]:
                    key[i%2] += 1
            print("CLOSE" if key == [0,1] else "DIFFERENT")

Python: while True:
    A = list(input().split("\""))
    if A[0] == ".":
        break
    
    B = list(input().split("\""))

    wrong = 0
    ans = ""

    for i in range(min(len(A),len(B))):
        if i%2 == 1:
            if A[i] != B[i]:
                wrong += 1
        else:
            if A[i] != B[i]:
                wrong = 2
    if wrong == 0:
        ans = "IDENTICAL"
    elif wrong == 1:
        ans = "CLOSE"
    else:
        ans = "DIFFERENT"   
    if len(A) != len(B):
        ans = "DIFFERENT"
    print(ans)

Python: results=[]
while True:
    a=list(map(input().split("\"")))
    if a[0]==".":
        break
    b=list(map(input().split("\"")))
    count1=0
    count2=0
    for i in range(int(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 len(a) != len(b):
        results.append(2)
    else:
        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")

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):
                if len(a[i]) == 0 and len(b[i]) != 0:
                    count1+=1
                elif len(a[i]) != 0 and len(b[i]) == 0:
                    count1+=1 
                else:
                    for k,l in zip(a[i],b[i]):
                        if(k!=l):
                            count1+=1
            else:
                if len(a[i]) == 0 and len(b[i]) != 0:
                    count2+=1
                elif len(a[i]) != 0 and len(b[i]) == 0:
                    count2+=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")

Python: results=[]
while 1:
    a=input().split("\"")
    if a[0]==".":
        break
    b=input().split("\"")
    count1=0
    count2=0
    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 len(a) != len(b):
        results.append(2)
    else:
        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")