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<stdio.h>

char s1[205],s2[205];
int c1,c2,t1,t2;
void init()
{
    for(int i=0;i<204;i++)
        s1[i]=s2[i]='\0';
}
int jump()
{
    while(s1[t1]!=';'&&s1[t1]!='"')
    {
        t1++;
        if(s1[t1]=='\0') return 1;
    }
    while(s2[t2]!=';'&&s2[t2]!='"') t2++;
    return 0;
}
int jump2()
{
    while(s1[t1]!='"')
    {
        t1++;
        if(s1[t1]=='\0') return 1;
    }
    while(s2[t2]!='"') t2++;
    return 0;
}
int main()
{
    while(1)
    {
        init();
        scanf("%s",s1);
        if(s1[0]=='.') return 0;
        scanf("%s",s2);
        int i, j;
        c1=c2=0;
        for(i=0;s1[i]!='\0';i++)
        {
            if(s1[i]=='"') c1++;

        }
        for(i=0;s2[i]!='\0';i++)
        {
            if(s2[i]=='"') c2++;

        }
        if(c1!=c2)
        {
            printf("DIFFERENT\n");
            continue;
        }
        t1=t2=0;
        int t=0;
        while(s1[t1]!='\0'||s2[t2]!='\0')
        {
            if(s1[t1]!=s2[t2])
            {
                t++;
                if(jump()||t==2) break;
            }
            t1++;
            t2++;
        }
        int flag=0;
        t1=t2=0;
        while(1)
        {
            if(jump2()) break;
            t1++;t2++;
            if(jump2()) break;
            t1++;t2++;
            while(s1[t1]!='\0'||s2[t2]!='\0')
            {
                if(s1[t1]!=s2[t2])
                {
                    flag=1;
                    break;
                }
                if(s1[t1]=='"') break;
                t1++;t2++;
            }
            if(flag==1) break;
        }
        if(flag) printf("DIFFERENT\n");
        else
        if(t==0) printf("IDENTICAL\n");
        else if(t==1) printf("CLOSE\n");
        else printf("DIFFERENT\n");
    }
}

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

int main(){
    int cnt;
    bool flag;
    std::string str1;
    std::string str2;
    std::string tmp1;
    std::string tmp2;
    while(true){
        flag = false;
        std::cin >> str1;
        if(str1=="."){
            break;
        }
        std::cin >> str2;
        cnt = 0;
        std::istringstream iss1(str1);
        std::istringstream iss2(str2);
        while(std::getline(iss1,tmp1,'"')){
            std::getline(iss2,tmp2,'"');
            if(flag){
                cnt++;
            }
            if(tmp1 == "\0"){
                cnt++;
            }
            if(tmp2 == "\0"){
                cnt++;
                flag = true;
            }
            if(tmp1 != tmp2){
                cnt++;
            }
        }
        if(cnt==0){
            std::cout << "IDENTICAL\n";
        }else if(cnt==1){
            std::cout << "CLOSE\n";
        }else{
            std::cout << "DIFFERENT\n";
        }
    }
}

C++: #include <iostream>
#include <string>
#include <vector>
 
using namespace std;
 
int main() {
    string s1, s2;
    while (cin >> s1) {
        if (s1 == ".") {
            break;
        }
        cin >> s2;
 
        if (s1 == s2) {
            cout << "IDENTICAL" << endl;
        }
        else {
            int s1c = 0;
            vector<string> s11;
            string subs1 = "";
            string kk = "";
            for (int i = 0; i < s1.size(); i++) {
                if (s1[i] == '"') {
                    subs1 += '"';
                    s1c++;
                    if (s1c % 2 == 0) {
                        s11.push_back('"' + kk + '"');
                        kk = "";
                    }
                }
                else if (s1c % 2 != 0) {
                    kk += s1[i];
                }
                else {
                    subs1 += s1[i];
                }
            }
            int s2c = 0;
            vector<string> s22;
            string subs2 = "";
            for (int i = 0; i < s2.size(); i++) {
                if (s2[i] == '"') {
                    subs2 += '"';
                    s2c++;
                    if (s2c % 2 == 0) {
                        s22.push_back('"' + kk + '"');
                        kk = "";
                    }
                }
                else if (s2c % 2 != 0) {
                    kk += s2[i];
                }
                else {
                    subs2 += s2[i];
                }
            }
            if (subs1 == subs2 && s11.size() == s22.size()) {
                int cc = 0;
                for (int i = 0; i < s11.size(); i++) {
                    if (s11[i] != s22[i]) {
                        cc++;
                    }
                }
                if (cc == 1) {
                    cout << "CLOSE" << endl;
                }
                else {
                    cout << "DIFFERENT" << endl;
                }
            }
            else {
                cout << "DIFFERENT" << endl;
            }
        }
 
    }
    return 0;
}