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)
}

C++: #include <iostream>
#include "string"

using namespace std;


int main(){
	while(1){
		string s1;
		cin>>s1;

		if(s1==".") break;

		string s2;
		cin>>s2;

		if(s1==s2){
			cout<<"IDENTIAL"<<endl;
			continue;
		}

		string t1=s1;
		string t2=s2;

		while (1) {
			size_t d1b=t1.find('\"');
			if(d1b==string::npos) break;
			t1.replace(d1b,1,"@");

			size_t d1e=t1.find('\"');
			t1.replace(d1e,1,"@");

			size_t d2b=t2.find('\"');
			if(d2b==string::npos) break;
			t1.replace(d2b,1,"@");

			size_t d2e=t2.find('\"');
			t1.replace(d2e,1,"@");

			string u1=s1;
			u1.replace(d1b+1,d1e-d1b-1,"");
			string u2=s2;
			u2.replace(d1b+2,d1e-d1b-2,"");

			if (u1==u2) {
				t1=u1;
				t2=u2;
				break;
			}
		}
		if(t1==t2) cout<<"CLOSE"<<endl;
		else cout<<"DEFFFENT"<<endl;
	}
	return 0;
}

C++: #include<iostream>
#include<string>
#include<list>
#include<vector>
using namespace std;


int main(){
	string s1,s2;
	while(true){
	cin>>s1;
	if(s1==".")break;
	cin>>s2;
	vector<string>p1,p2;//program 1,program2
	vector<string>t1,t2;//text1 text2

	bool flag=false;//f ???????????? !f ????????°??????
	int cnt=0;//?\???°????????????????????¶??°???????????°??????
	string tmpp,tmpt;

	for(int i=0;i<s1.size();i++){
		if(s1[i]=='"'){
			if((cnt+1)%2==0){//?????????????????????
				t1.push_back(tmpt);
				tmpt.clear();
			}

			else{//????????°???????????????
				p1.push_back(tmpp);
				tmpp.clear();
			}

			cnt++;
		}
		else{
			if((cnt+1)%2==0){//????????????
				tmpt.push_back(s1[i]);
			}
			else{//????????°??????
				tmpp.push_back(s1[i]);
			}
		}
	}
	if(s1[s1.size()-1]!='"')p1.push_back(tmpp);


 flag=false;//f ???????????? !f ????????°??????
	 cnt=0;//?\???°????????????????????¶??°???????????°??????
	tmpp.clear();tmpt.clear();
	for(int i=0;i<s2.size();i++){
		if(s2[i]=='"'){
			if((cnt+1)%2==0){//?????????????????????
				t2.push_back(tmpt);
				tmpt.clear();
			}

			else{//????????°???????????????
				p2.push_back(tmpp);
				tmpp.clear();
			}

			cnt++;
		}
		else{
			if((cnt+1)%2==0){//????????????
				tmpt.push_back(s2[i]);
			}
			else{//????????°??????
				tmpp.push_back(s2[i]);
			}
		}
	}

	if(s2[s2.size()-1]!='"')p2.push_back(tmpp);

	if(p1.size()!=p2.size()||t1.size()!=t2.size()){
		cout<<"DIFFERENT"<<endl;	
	}
	else{
	int wcnt=0;
	bool pflag=true;
	for(int i=0;i<p1.size();i++){
		if(p1[i]!=p2[i])pflag=false;
	}

	for(int i=0;i<t1.size();i++){
		if(t1[i]!=t2[i])wcnt++;
	}
	//for(int i=0;i<p1.size();i++)cout<<p1[i]<<" "<<p2[i]<<endl;
	//for(int i=0;i<t1.size();i++)cout<<t1[i]<<" "<<t2[i]<<endl;
	if(pflag&&wcnt==0)cout<<"IDENTICAL"<<endl;
	else if(pflag&&wcnt==1)cout<<"CLOSE"<<endl;
	else cout<<"DIFFERENT"<<endl;
	}
	}
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
string s1,s2; 

int main(){
	while(1){
		string ss1[200],ss2[200];
		string tt1[200],tt2[200]; 
		s1="";
		s2="";
		cin>>s1;
		if(s1[0]=='.') break;
		cin>>s2;
		int pc1=0,kc1=0,cnt=0;
		for(int i=0;i<s1.size();i++){
			if(s1[i]=='"'){
				cnt++;
				if(cnt==2){
					pc1++; 
					kc1++;
					cnt=0;
				}
				continue;
			}
			if(cnt==1){
				tt1[kc1]+=s1[i];
				continue;
			}
			if(s1[i]==';'){
				pc1++;
				continue; 
			}
			ss1[pc1]+=s1[i];
		}
		int pc2=0,kc2=0;
		for(int i=0;i<s2.size();i++){
			if(s2[i]=='"'){
				cnt++;
				if(cnt==2){
					pc2++; 
					kc2++;
					cnt=0;
				}
				continue;
			}
			if(cnt==1){
				tt2[kc2]+=s2[i];
				continue;
			}
			if(s2[i]==';'){
				pc2++;
				continue; 
			}
			ss2[pc2]+=s2[i];
		}
	//	for(int i=0;i<kc1;i++){
	//		cout<<i<<tt1[i]<<" "<<tt2[i]<<endl;
	//	}
		if(pc1!=pc2||kc1!=kc2){
			cout<<"DIFFERENT"<<endl;
			continue;
		}
		int flg=0;
		for(int i=0;i<=pc1;i++){
			if(ss1[i]!=ss2[i]){
				flg=2; 
			}
		}
		for(int i=0;i<kc1;i++){
			if(tt1[i]!=tt2[i]) flg++;
			if(flg>=2) break;
		} 
		if(flg==0) cout<<"IDENTICAL"<<endl;
		if(flg>=2) cout<<"DIFFERENT"<<endl;
		if(flg==1) cout<<"CLOSE"<<endl;
	}
} 

/*
print"hello";print123
print"hello";print123
read"B1input";solve;output;
read"B2";solve;output;
read"C1";solve;output"C1ans";
read"C2";solve;output"C2ans";
""""""""
"""42"""""
slow"program"
fast"code"
"super"fast"program"
"super"faster"program"
X""
X
I"S""CREAM"
I"CE""CREAM"
11"22"11
1"33"111
.
*/

C++: #include <iostream>
using namespace std;

int main(){
	while(1){
		string s1,s2;
		cin >> s1;
		if(s1==".")break;
		cin >> s2;

		if(s1==s2){
			cout << "IDENTICAL" << endl;
			continue;
		}

		string t1,t2;
		t1 = s1;t2 = s2;
		while(1){
			size_t d1b = t1.find('\"');
			if(d1b==string::npos)break;
			t1.replace(d1b,1,"@");
		
			size_t d1e = t1.find('\"');
			t1.replace(d1e,1,"@");
		
			size_t d2b = t2.find('\"');
			if(d2b==string::npos)break;
			t2.replace(d2b,1,"@");
		
			size_t d2e = t2.find('\"');
			t2.replace(d2e,1,"@");

			string u1 = s1;
			u1.replace(d1b+1,d1e-d1b-1,"");
			string u2 = s2;
			u2.replace(d2b+1,d2e-d2b-1,"");
	
			if(u1==u2){
				t1 = u1;
				t2 = u2;
				break;
			}
		}
		if(t1==t2){
			cout << "CLOSE" << endl;
		}else{
			cout << "DIFFERENT" << endl;
		}
	}
	return 0;
}