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>

using namespace std;

int main(){

  char s1[200]={};
  char s2[200]={};
  char t1[200]={};
  char t2[200]={};
  char u1[200]={};
  char u2[200]={};

  int c=0,flag=0,j=0,k=0,l=0;

  for(int x=0;x<100;x++){


  cin>>s1;
  if(s1[0]=='.') break;               //input
  cin>>s2;


  for(int i=0;i<200;i++){           
    if(s1[i]=='"'){
      if(flag==0){
	flag=1;
	
      }else if(flag==1){
	flag=0;
	
      }
    }

    if(flag==1){                   //copy to u
      t1[j]=s1[i];
      j++;    
    }

    if(flag==0){                 //copy to t
      u1[l]=s1[i];
      l++;    
    }


  }
  j=0;
  l=0;
  flag=0;

  for(int i=0;i<200;i++){             

    if(s2[i]=='"'){
      if(flag==0){
	flag=1;
	
      }else if(flag==1){
	flag=0;
	
      }
    }

    if(flag==1){                       //copy to t

      t2[j]=s2[i];
      j++;
    }

 if(flag==0){                            //copy to u
      u2[l]=s2[i];
      l++;
    }

  }
 j=0;
 l=0;
 flag=0;

 
   
 for(int i=0;i<150;i++){           //check in " "


    if(flag==1){
    if(t1[j]!=t2[k]){
      c++;
      flag=0;
    }

    if(t1[j]=='"' && t2[k]!='"'){
      j--;
    }
    if(t2[k]=='"' && t1[j]!='"'){
      k--;
    }

    j++;
    k++;

    }

   if(t1[j]=='"' && t2[k]=='"'){
     flag=1;

    }


  }

    j=0;
    k=0;
    l=0;
    flag=0;


 for(int i=0;i<200;i++){               //check out " "
    if(u1[i]!=u2[i]){
      c=2;
    }
  }

    if(c==0){
      cout<<"IDENTICAL"<<endl;
    }else if(c==1){
      cout<<"CLOSE"<<endl;
    }else{
      cout<<"DIFFERENT"<<endl;
    }

    c=0;

   
    cout<<t1<<endl;
    cout<<t2<<endl;
    cout<<u1<<endl;
    cout<<u2<<endl;
    for(int i=0;i<200;i++){
     s1[i]=0;
    s2[i]=0;
    t1[i]=0;
    t2[i]=0;
    u1[i]=0;
    u2[i]=0;
    }

  }

  return 0;
}

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

void split(string s, vector<string> &v){
    v.clear();
    s +='"';
    string str="";
    for(int i=0;i<s.size();i++){
        if(s[i]=='"'){
            v.push_back(str);
            str="";
        }
        else{
            str+=s[i];
        }
    }
}
int main(){
    while(1){
        string s1,s2; cin >>s1;
        if(s1==".")break;
        cin >> s2;
        if(s1==s2){
            cout << "IDENTICAL"<< endl;
        }
        else{
            vector<string> v1,v2;
            split(s1,v1);
            split(s2,v2);
            if(v1.size()!=v2.size()){
                cout << "DIFFERENT" << endl;
            }
            else{
                bool a=false;
                int cnt=0;
                for(int i=0;i<v1.size();i++){
                    if(i%2==0){
                        if(v1[i]!=v2[i]){
                            a = true;
                        }
                    }
                    else{
                        if(v1[i]!=v2[i])cnt++;
                    }
                }
                if(a){
                    cout << "DIFFERENT" << endl;

                }
                if(cnt>1){
                    cout << "DIFFERENT" << endl;
                }
                else{
                    cout << "CLOSE" << endl;
                }
            }
        }
    }
}

C++: #include <cstdio>
#include <cstring>
#include <cstdlib>
#include <iostream>
using namespace std;
char s[1000],ss[1000];
int va[1000],vb[1000];
char a[1000][1000],b[1000][1000],sa[1000][1000],sb[1000][1000];
int main()
{
while (1)
{
cin>>s;
if (strcmp(s,".")==0) break;
cin>>ss;
int lens=strlen(s);
int lenss=strlen(ss);
int v=0;
if (lens==lenss)
{
    for (int i=0;i<=lens-1;i++)
    if (s[i]!=ss[i]) {v=1; break;}
    if (v==0) {printf("IDENTICAL\n"); continue;}
}
memset(va,0,sizeof(va));
memset(vb,0,sizeof(vb));
int o=1;
int i=0;
int l=0;
int k=0;
while (i<=lens-1)
{
    if (s[i]=='"')
    {
        a[o][l]='\0';
        l=0;
        i++;
        k++;
        if (k%2==0) va[o]=1;
        o++;
    } else
    {
       a[o][l]=s[i];
       l++;
       i++;
    }
}
if (s[lens-1]!='"') a[o][l]='\0';
int oo=1;
i=0;
l=0;
k=0;
while (i<=lenss-1)
{
    if (ss[i]=='"')
    {
        b[oo][l]='\0';
        l=0;
        i++;
        k++;
        if (k%2==0) vb[oo]=1;
        oo++;
    } else
    {
        b[oo][l]=ss[i];
        l++;
        i++;
    }
}
if (ss[lenss-1]!='"') b[oo][l]='\0';
int numa=0,numb=0;
for (int i=1;i<=o;i++)
if (va[i])
{
    numa++;
    strcpy(sa[numa],a[i]);
}
for (int i=1;i<=oo;i++)
if (vb[i])
{
    numb++;
    strcpy(sb[numb],b[i]);
}
if (numa!=numb) printf("DIFFERENT\n"); else
{
    int num=0;
    for (int i=1;i<=numa;i++)
    if (strcmp(sa[i],sb[i])!=0)
    num++;
    if (num>1) printf("DIFFERENT\n"); else
    {
      numa=0; numb=0;
      for (int i=1;i<=o;i++)
      if (!va[i])
      {
        numa++;
        strcpy(sa[numa],a[i]);
      }
      for (int i=1;i<=oo;i++)
      if (!vb[i])
      {
        numb++;
        strcpy(sb[numb],b[i]);
      }
      if (numa!=numb) printf("DIFFERENT\n"); else
      {
          int vv=0;
          for (int i=1;i<=numa;i++)
            if (strcmp(sa[i],sb[i])!=0)
          {
              vv=1;
              break;
          }
          if (vv==1) printf("DIFFERENT\n"); else printf("CLOSE\n");
      }
    }
}
}
    return(0);
}