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: # AOJ 1617: Almost Identical Programs
# Python3 2018.7.13 bal4u

s = {0:"IDENTICAL", 1:"CLOSE", 2:"DIFFERENT"}
while True:
	s1 = input();
	if s1 == '.': break
	s1 = list(s1)
	s2 = list(input())
	w1, w2 = len(s1), len(s2)
	i = j = 0
	ans, k = -1, 0
	while i < w1 and j < w2:
		if s1[i] != s2[j]: ans = 2; break
		if s1[i] == '"':
			i, j = i+1, j+1
			wi, wj = i, j
			while s1[i] != '"': i += 1
			while s2[j] != '"': j += 1
			if s1[wi:i] != s2[wj:j]: k += 1
			if k > 1: ans = 2; break
		i, j = i+1, j+1
	if ans < 0:
		if (i < w1 and j < w2 and s1[i] == s2[j]) \
		    or (i == w1 and j == w2): ans = k
		else: ans = 2
	print(s[ans])

Python: 
while True:
    s1=input().split('"')
    if s1==["."]: break
    s2=input().split('"')
    if len(s1)!=len(s2):
        print("DIFFERENT")
        continue
    else:
        cnt=0
        for i in range(len(s1)):
            if s1[i]!=s2[i]:
                cnt+=1
            else: pass
        if cnt==0:
            print("IDENTICAL")
        elif cnt==1:
            print("CLOSE")
        else: 
            print("DIFFERENT")

Python: results=[]
while True:
    a=input().split("\"")
    if a[0]==".":
        break
    b=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("\"")
    count=0
    for i,j in zip(range(len(a)),range(len(b))):
        for k,l in zip(a[2*i+1],b[2*j+1]):
            if(k!=l):
                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: #16D8101014F 久留米 竜之介 Python3
#a=[]
while(True):
	i=0
	tmp=0
	a=input().split('"') 
	aL=len(a)
	if a[0] ==".":
		break
	b=input().split('"')
	bL=len(b)
		
	if aL != bL:
		print("DIFFERENT")
	else:
		while(True):
			if a[i] != b[i]:
				print("DIFFERENT")
				break
			elif i > aL-2:
				if tmp==1:
					print("CLOSE")
					break
				else:
					print("IDENTICAL")
					break
			elif a[i+1] != b[i+1]:
				if tmp==1:
					print("DIFFERENT")
					break
				else: tmp=1
			i +=2

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]):
                    if(a[l:i] == b[l+idx_dif:i+idx_dif]):
                        l = i+1
                        flag = 1
                    else:
                        flag = 2
                    break
                                #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")