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 judge(string s1, string s2){
	int symbol1[200]={0}, symbol2[200]={0};
	int wrong=0, num1=0, num2=0, a;
	int first1=0, first2=0, end1, end2;
	int size = max(s1.size(), s2.size() );
	char j='\"';
	/* search " " */
	
	for(int i=0; i<size; i++){
		
		if(s1[i] == j){
			symbol1[num1++] = i;
		}
		if(s2[i] == j){
			symbol2[num2++] = i;
		}
	}
	
	for(int i=0; i<num1; i++){
		cout << symbol1[i] << "\n";
	}

	a = 0;
	end1 = symbol1[a];
	end2 = symbol2[a];
	
	/* out of "" */
	
	int k;
	while(k=1){
		if(end1 - first1 != end2 - first2){
			wrong += 3;
			break;
		}
		
		for(int i=0; i<size; i++){
			if(end1 - first1 == 0){
				break;
			}
			if(s1[first1++] != s2[first2++]){
				wrong += 3;
				/*cout << s1[first1-1] <<" " << s2[first2-1]<<"\n";*/
			}
			if(i == end1 - first1){
				break;
			}
		}
		
		first1 = symbol1[++a];
		first2 = symbol2[a];
		end1 = symbol1[++a];
		end2 = symbol2[a];
		
		if(a == size || symbol1[a] == 0 || symbol2[a] == 0){
			break;
		}
	}
	
	/* in " " */
	
	a = 0;
	first1 = symbol1[a];
	first2 = symbol2[a];
	end1 = symbol1[++a];
	end2 = symbol2[a];
	
	while(k=1){
		for(int i=0; i<size; i++){
			
			if(end1 - first1 != end2 - first2){
				wrong += 1;
				break;
			}
			
			if(s1[first1++] != s2[first2++]){
				wrong += 1;
				/*cout << s1[first1-1] <<" " << s2[first2-1];*/
			}
			if(i == end1 - first1 ){
				break;
			}
		}
		
		first1 = symbol1[++a];
		first2 = symbol2[a];
		end1 = symbol1[++a];
		end2 = symbol2[a];
		
		if(symbol1[a] == 0 || symbol2[a] == 0){
			break;
		}
	}
	
	return wrong;
}


int main(void){
	string st1, st2;
	int pi, d;
	
	for(int i=0; i<100; i++){
		for(int k=0; k<2; k++){
			if(k == 0){
				cin >> st1;
				if(st1 == "."){
					pi = 1;
					break;
				}
			}else{
				cin >> st2;
			}
		}
		
		if(pi == 1){
				break;
			}
		d = judge(st1, st2);
		
		if(d == 0){
			cout <<"ICENTICAL\n";
		}else if(d == 1){
			cout << "CLOSE\n";
		}else{
			cout << "DIFFERENT\n";
		}
	}
	
	return 0;
}

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

string exec(vector<string> &v, string s){
    string ret = "";
    for(int i = 0; i < s.length(); i++){
        if(s[i] == '"'){
            i++;
            string tmp = "";
            while(i < s.length() && s[i] != '"')  tmp += s[i], i++;
            v.push_back(tmp);
            ret += "_";
        }else{
            ret += s[i];
        }
    }
    return ret;
}

int main(){
    string s, t;
    while(cin >> s, s != "."){
        cin >> t;
        int slen = s.length(), tlen = t.length();
        vector<string> vs, vt;
        string ss = exec(vs, s);
        string tt = exec(vt, t);
        
        if(ss != tt || vs.size() != vt.size()){
            cout << "DIFFERENT" << endl;
            continue;
        }

        int cnt = 0;
        for(int i = 0; i < vs.size(); i++){
            if(vs[i] != vt[i])  cnt++;
        }

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

    }

    return 0;
}

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

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

		if(s1=="."){
			break;
		}

		string s2;
		cin>>s2;

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

		string t1=s1;
		string t2=s2;
 	
		while(true){
			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;
}

C++: #include <stdio.h>
#include <iostream>
#include <vector>
#include <string>
using namespace std;

string s;
string tt;
int ans;
int ff;

int main(){
  cin >> s;
  while(s!="."){
    ans=0;
    ff=0;
    int i=0;
    int j=0;
    cin >> tt;
    for(;i<int(s.size())&&j<int(tt.size());){
      if(s[i]==tt[j]&&s[i]!=0x22&&tt[j]!=0x22){
        ++i;
        ++j;
        continue;
      }
      if(s[i]!=tt[j]){
        ans=1;
        break;
      }
      if(s[i]==0x22&&tt[j]==0x22){
        ++i;
        ++j;
        if((s[i]==0x22||tt[j]==0x22)&&s[i]!=tt[j]){
          ++ff;
        }
        else{
          for(;s[i]!=0x22&&tt[j]!=0x22;){
            if(s[i]!=tt[j]){
              ++ff;
              break;
            }
            ++i;
            ++j;
          }
        }
        while(s[i]!=0x22){
          ++i;
        }
        while(tt[j]!=0x22){
          ++j;
        }
        ++i;
        ++j;
      }

      if(ans==1)break;
    }
    if(i==int(s.size())&&j==int(tt.size())){}
    else{
      ans=1;
    }
    if(ans==1||ff>=2){
      printf("DIFFERENT\n");
    }
    else if(ff==0){
      printf("IDENTICAL\n");
    }
    else{
      printf("CLOSE\n");
    }
    cin >> s;
  }
}