Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

var sc = bufio.NewScanner(os.Stdin)
var out = bufio.NewWriter(os.Stdout)

func main() {
	sc.Split(bufio.ScanLines)
	defer out.Flush()

	for sc.Scan() {
		a, b := nextInts()
		x, y := gcd(a, b), lcm(a, b)
		fmt.Fprintf(out, "%d %d\n", x, y)
	}

}

func nextInts() (a, b int) {
	s := strings.Split(sc.Text(), " ")
	ra, _ := strconv.Atoi(s[0])
	rb, _ := strconv.Atoi(s[1])
	a = ra
	b = rb
	return
}

func gcd(x, y int) int {
	if x < y {
		gcd(y, x)
	}
	for 0 < y {
		r := x % y
		x, y = y, r
	}
	return x
}

func lcm(x, y int) int {
	return (x * y) / gcd(x, y)
}

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

int main(){
//old
		/* 2014 ??????1
		int a[2],ans;
		cin >> a[0] >> a[1];
		ans = a[0] * a[1];
		cout << ans << endl;
		*/
		/* 2014 ??????2
		int a[6],ans = 0;
		cin >> a[0] >> a[1] >> a[2] >> a[3] >> a[4] >> a[5];
		if(a[0] + a[1] * 5 + a[2] * 10 + a[3] * 50 + a[4] * 100 + a[5] * 500 >= 1000) ans = 1;
		cout << ans << endl;
		*/
		/* 2014 ??????3
		int a,i = 0;
		cin >> a;
		int b[a],c[a],ans[a];
		while(a > i){
			cin >> b[i] >> c[i];
			ans[i] =  b[i] % c[i];
			if(ans[i] == 0) ans[i] = c[i];
			i++;
		}
		i = 0;
		while(a > i){
		cout << ans[i] << endl;
		i++;
		}
		*/
		/* 2014 ??????4
		int a[2],i = 1;
		cin >> a[0];
		int n[a[0]],m[a[0]];
		while (a[0] >= i){
			cin >> n[i] >> m[i];
			i++;
		}
		i = 1;
		cin >> a[1];
		int o[a[1]],p[a[1]];
		while (a[1] >= i){
			cin >> o[i] >> p[i];
			i++;
		}
		i = 1;
		int ii,c,aa;
		aa = a[0] + a[1];
		int ans[aa][2],hh[aa],mm[aa],chk,count = 1;
		while(aa >= i){
			ii = 1;
			chk = 1;
			if(a[0] >= i){
				while(i - 1 >= ii){
					if(n[i] == hh[ii] and m[i] == mm[ii]){
						chk = 0;
					}
					ii++;
				}
				if(chk == 1){ 
					hh[count] = n[i];
					mm[count] = m[i];
					count++;
				}
			}else{
				while(i - 1 >= ii){
					if(o[i - a[0]] == hh[ii] and p[i - a[0]] == mm[ii]){
						chk = 0;
					}
					ii++;
				}
				if(chk == 1){ 
					hh[count] = o[i - a[0]];
					mm[count] = p[i - a[0]];
					count++;
				}		

			}
			i++;
		}
		aa = count - 1;
		i = 1;
		while(aa >= i){
			ii = 1;
			c = 1;
				while(aa >= ii){
						if(hh[i] > hh[ii] or hh[i] == hh[ii] and mm[i] > mm[ii] and i != ii){
							c++;
						}
				ii++;
				}
			ans[c][0] = hh[i];
			ans[c][1] = mm[i];
		 i++;
		}
		i = 1;
		while(aa >= i){
			if(aa == i){
				if(ans[i][1] < 10){
					cout << ans[i][0] << ":" << "0" << ans[i][1] << endl;;
				}else{
					cout << ans[i][0] << ":" << ans[i][1] << endl;;
				}

			}else{
				if(ans[i][1] < 10){
					cout << ans[i][0] << ":" << "0" << ans[i][1] << " ";
				}else{
					cout << ans[i][0] << ":" << ans[i][1] << " ";
				}
			}
			i++;
		}
		//????????°???
		int n,i,ans = 100000,a,risi[2];
		cin >> n;
		for(i = 1;n >= i;i++){
			risi[0] =  ans * 0.05;
			risi[1] = risi[0];
			while(risi[1] >= 1000){risi[1] = risi[1] - 1000;}
				if(risi[1] > 0){risi[0] = risi[0] - risi[1] + 1000;}
			ans = ans + risi[0];
		}
		cout << ans << endl;
		*/
		/*int in,i[4];
		while(cin >> in){
		int ans = 0;
		for(i[0] = 0;9 >= i[0];i[0]++){
			//if(0 > in - i[0]) break;
			//cout << "[1]" <<  i[0] << endl;				
			for(i[1] = 0;9 >= i[1];i[1]++){
				//if(0 > in - ( i[0] + i[1] ) ) break;
				//cout << "[2]" << i[1] << endl;
				for(i[2] = 0;9 >= i[2];i[2]++){
					//if(0 > in - ( i[0] + i[1] + i[2] ) ) break;
					//cout << "[3]" << i[2] << endl;
					for(i[3] = 0;9 >= i[3];i[3]++){
						//if(0 > in - ( i[0] + i[1] + i[2] + i[3] ) ) break;
						//cout << "[4]" << i[3] << endl;
						//cout << "[1] " << i[0] << "  [2] " << i[1] << "  [3] " << i[2] << "  [4] " << i[3] << endl; 
						if(i[0] + i[1] + i[2] + i[3] == in){
						//cout << "[1] " << i[0] << "  [2] " << i[1] << "  [3] " << i[2] << "  [4] " << i[3] << endl; 
						ans++;
						}
					}	
				}
			}
		}
		cout << ans << endl;	
		}*/

		/*int in;
		cin >> in;
		int a[in];
		for(int i = 1;in >= i;i++){
			cout << "[IN] [" << i << "] ";
			cin >> a[i];
		}
		for(int i = 1;in >= i;i++){cout << "[OUT] ["<< i << "] " <<  a[i] << endl;}*/
//old;
		int a,b,GCD[2],OUTPUT[2];
		cin >> a >> b;
		GCD[0] = a;GCD[1] = b;
		while(GCD[0] != GCD[1]){
			if(GCD[0] > GCD[1]){
				GCD[0] = GCD[0] - GCD[1];
			}else if(GCD[1] > GCD[0]){
				GCD[1] = GCD[1] - GCD[0];
			}			
		}
		OUTPUT[0] = GCD[1];
		OUTPUT[1] = a * b / OUTPUT[0];
		cout << OUTPUT[0] << " " << OUTPUT[1] << endl;
}

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

long gcd(long a, long b) {
  long c;
  if(a < b) {
    long temp = a;
    a = b; 
    b = temp;
  }
 
  while (b != 0) {
    c = a % b;
    a = b;
    b = c;
  }

  return a;
}

int main(){
  long a, b;
  
  while(cin >> a >> b) {
    long GCD = gcd(a, b);
    long LCM = a * b / GCD;
    cout << GCD << " " << LCM << endl;
  }
  return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <set>
#include <map>
#include <bitset>
#include <cmath>
#include <queue>
#include <stack>
using namespace std;
long long gcd(long long a,long long b)
{
	if(b==0)   return a;
	return gcd(b,a%b);
}
long long n,m;
int main()
{
    while(cin>>n>>m)
	{
		cout<<gcd(n,m)<<" "<<n*m/gcd(n,m)<<endl;
	}
    return 0;
}

C++: #include<iostream>

#define     MAX_NUMBER         2000000000
#define     __ERROR_CODE__     (-1)

using namespace std;

int Integer_LCM(const unsigned int,const unsigned int);
int Integer_GCD(const unsigned int,const unsigned int);

int main(){
	int a,b;

	while(cin >> a >> b){
		cout << Integer_LCM(a,b) << " " << Integer_GCD(a,b) << endl;
	}

	return 0;
}

int Integer_LCM(const unsigned int a,const unsigned int b){
	int p,q,r;

	// 入力値の確認
	if((a <= 0) || (b <= 0) || (a > ((int)(MAX_NUMBER))) || (b > ((int)(MAX_NUMBER)))){
		return ((int)(__ERROR_CODE__));
	}

	// 変数の初期化
	p = a;
	q = b;
	r = a % b;

	// ユークリッドの互除法
	while (r != 0){
		p = q;
		q = r;
		r = p % q;
	}

	return q;
}

int Integer_GCD(const unsigned int a,const unsigned int b){
	// 入力値の確認
	if((a <= 0) || (b <= 0) || (a > ((int)(MAX_NUMBER))) || (b > ((int)(MAX_NUMBER)))){
		return ((int)(__ERROR_CODE__));
	}

	return ((int)( ((double)a) / Integer_LCM(a,b) )) * b;
}

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

long long int gcd(long long int a,long long int b){
	if(b==0)	return a;
	return gcd(b,a%b);
}
	
int main(){
	long long int a,b,M,N;
	while(cin >> a>>b){
		long long int g = gcd(a,b);
		cout << g << ' ' << a/g*b << endl;
	}
	return 0;
}

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

int gcd(int a, int b){
	int r, tmp;

	if(a == 0 || b == 0){
		return 0;
	}

	if(a < b){
			tmp = a;
			a = b;
			b = tmp;
		}

		r =  a % b;
		while(r != 0){
			a = b;
			b = r;
			r = a % b;
		}
		return b;
}

int lcm(int a, int b){
	if(a == 0 || b == 0){
		return 0;
	}

	return (a * b/ gcd(a,b));
}

int main(){
	int a, b, r;
	int lcm_num, gcd_num;
	while(cin >> a >> b){
		gcd_num = gcd(a, b);
		lcm_num = lcm(a, b);
		cout << gcd_num << " " << lcm_num << endl;
	}
}

C++: #include <iostream>
using namespace std;
int main(){
    int a,b,lcm=0,r,x,y,count=0;
    while(cin>>a>>b){
        count++;
        if(count==50)break;
        x=a;
        y=b;
        while(1){
        r=a%b;
        a=b;
        b=r;
        if(r==0)break;
        }
        lcm=a;
    cout<<lcm<<" "<<x*y/lcm<<endl;
}
}