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() {
		x, y := nextInts()
		if x < y {
			rep := x
			x, y = y, rep
		}
		gcd := x % y
		lcm := x * y
		for gcd != 0 {
			x, y, gcd = y, gcd, x%y
		}
		fmt.Fprintf(out, "%d %d\n", y, lcm/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
}

C++: #include <iostream>
#include <math.h>
#include <algorithm>
#include <string>
#include <stack>
#include <queue>
#include <set>
#include <cstdio>
using namespace std;

#define FOR(i, n) for(int i = 0; i < n; i++)

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> VI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef pair<long long, long long>PLL;
typedef queue<int> QI;
typedef priority_queue<int> maxpq;
typedef priority_queue<int, vector<int>, greater<int> > minpq;

struct edge{int to, cost;};

void begin(){cin.tie(0); ios::sync_with_stdio(false);};
int gcd(int a, int b){if(a%b==0){return(b);}else{return(gcd(b,a%b));}};
int lcm(int m, int n){if((0 == m)||(0 == n)){return 0;} return ((m / gcd(m, n)) * n);};
unsigned long long comb(long n, long m){unsigned long long c = 1; m = (n - m < m ? n - m : m);
    for(long ns = n - m + 1, ms = 1; ms <= m; ns ++, ms ++){c *= ns; c /= ms;} return c;};

void warshallFloyd(int d[100][100], int n){
    for(int k = 0; k < n; ++k)
        for(int i = 0; i < n; ++i)
            for(int j = 0; j < n; ++j)
                if(d[i][k] != -1 && d[k][j] != -1){
                    if(d[i][j] == -1){
                        d[i][j] = d[i][k] + d[k][j];
                    }else{
                        d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
                    }
                }
};


// d:隣接行列  n:グラフのサイズ  s:始点  dist:始点からの距離が入る配列
void dijkstra(int d[1000][1000], int n, int s, int dist[1000]){
    FOR(i, n) dist[i] = -1;
    dist[s] = 0;
    priority_queue<PII, vector<PII>, greater<PII> > q;
    q.push(PII(0, s));
    while (!q.empty()) {
        PII p = q.top(); q.pop();
        int i = p.second;
        if(dist[i] < p.first) continue;
        for(int j = 0; j < n; j++){
            if(d[i][j] == -1) continue;
            if(dist[j] == -1){
                dist[j] = dist[i] + d[i][j];
                q.push(PII(dist[j], j));
            }else if(dist[j] > dist[i] + d[i][j]){
                dist[j] = dist[i] + d[i][j];
                q.push(PII(dist[j], j));
            }
        }
    }
};

int main(int argc, const char * argv[]){
    begin();
    int a, b;
    while(cin >> a >> b){
        cout << gcd(a, b) << " " << lcm(a, b) << endl;
    }
}

C++: #include<iostream>

using namespace std;

int gcd(int x,int y) {//??????????????????????????????
	int r;
	if (x < y)swap(x, y);
	while (y > 0) {
		r = x%y;
		x = y;
		y = r;
	}
	return x;
}

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

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

int main()
{
    long a,b,n=0;
    while(cin >> a >> b){
        if (a>b) {
            n = b;
            while (a % b != 0) {
                b = a % b;
            }
            cout << b << " " << a*n/b << endl;
        }
        
        if (b>a) {
            n = a;
            while (b % a != 0) {
                a = b % a;
            }
            cout << a << " " << b*n/a << endl;
        }

    }
}

C++: /*
C++ ???????????????????????????????????¬??????
??????AOJ-ITP1??????????????????
*/
#define _USE_MATH_DEFINES

#include <iostream> // ?¨??????\??????
#include <fstream>  // ??????????????\??????
#include <string>   // ???????????¢???
#include <vector>   // ???????????????
#include <cmath>    // ??°??????
#include <iomanip>  // stream???????????¢???
#include <algorithm>// max??¢??°??????

using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::vector;        // ????´???°????????????????????????
using std::fixed;         // ???????????????????¨???????????????????????????????
using std::setprecision;  // ?????°????°???°?????\???????????°????????????????????¨????????\???

int main() {
	int a[2];
	int tmp;
	int GCD = 1;
	int LCM = 1;
	while (cin >> a[0] >> a[1])
	{
		// ????????????????????????
		if (a[0] < a[1]) {
			tmp = a[0];
			a[0] = a[1];
			a[1] = tmp;
		}
		else {}
		// ?????§??¬?´???°????¨????
		for (size_t i = 1; i < a[0]; i++)
		{
			if (a[0] % i == 0 && a[1] % i == 0)
			{
				GCD = i;
			}
		}

		// ????°???¬?????°????¨????
		for (size_t i = 1;; i++)
		{
			if (i*a[1] % a[0] == 0) {
				LCM = i*a[1];
				break;
			}
		}
		// ??????
		cout << GCD << " " << LCM << endl;
	}
	return 0;
}

C++: #include <stdio.h>
int main(void){
    int a, b, c, d, tmp;
        scanf("%d %d", &a, &b);
     d = a * b;
    if(a < b) {
        tmp = a;
        a = b;
        b = tmp;
    }
     c = a % b;
    while(c != 0) {
        a = b;
        b = c;
        c = a % b;
    }
        printf("%d %d\n", b, d / b);
            return 0;
}

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

int main(void)
{
  long long unsigned int a, b, x, y, gcd, lcm, r;

  while(scanf("%llu %llu", &a, &b) != EOF)
    {
      r = 1;
      x = a;
      y = b;

      while(r != 0)
	{
	  r = x % y;
	  x = y;
	  y = r;
	}
      gcd = x;

      lcm = a * b / gcd;

      cout << gcd << " " << lcm << endl;
    }
  return 0;
}

C++: #include<iostream>

int main(){
	int a[44722],b,c,d,e=0,f=1;
	while(std::cin >> b >> c){
	for(d=2;d*d<=b||d*d<=c;){
		if(b%d==0&&c%d==0){
			a[e] = d;
			e++;
			b = b / d;
			c = c / d;
		}else break;
	}
	for(d=3;d*d<=b||d*d<=c;d=d+2){
		while(1){
			if(b%d==0&&c%d==0){
			a[e] = d;
			e++;
			b = b / d;
			c = c / d;
			}else break;
		}
	}
	a[e] = 0;
	for(e=0;a[e]>0;e++){
		f = f * a[e];
	}
	std::cout << f;
	f = f * b * c;
	std::cout << " " << f << std::endl;
	e = 0;
	f = 1;
	}

	return 0;
}

C++: #include<iostream>
#include<string>
#include<iomanip>
using namespace std;
int main(){
	int a,b;
	while(cin>>a>>b){
		int x=a,y=b;
		while(true){
			if(x==y)
				break;
			if(x>y)
				x-=y;
			else if(y>x)
				y-=x;
		}
		cout<<x<<" ";
		int keep=x;
		x=a/keep;
		y=b/keep;
		cout<<x*y*keep<<endl;
	}
	return 0;
}

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

unsigned GCD(unsigned a, unsigned b)
{
	unsigned s=(a<b)?a:b, l=(a<b)?b:a;
	unsigned gcd=1;
	for(unsigned i=2; i<=s; ++i)
	{
		while(s%i==0 && l%i==0)
		{
			s/=i;
			l/=i;
			gcd*=i;
		}
	}
	return gcd;
}

unsigned LCM(unsigned a, unsigned b)
{
	unsigned large = (a<b)?b:a;
	unsigned x = large;
	for(unsigned i=1; x<2000000000; ++i)
	{
		if(x%a==0 && x%b==0)
		{
			return x;
		}
		x+=large;
	}
}

int main()
{
	double a,b;
	while(cin>>a>>b)
	{
		cout << GCD(a,b) << ' ' << LCM(a,b) << '\n';
	}
}

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

//max 
long int gcd(long int a, long int b){
    if((a==0 || b==0)) return 0;
    while(a!=b){
        if(a>b) a=a-b;
        else b=b-a;
    }
    return a;
}

//min
long int lcm(long int a, long int b){
    if((a==0||b==0)) return 0;
    return ((a / gcd(a, b)) * b);
}
int main(void){
    long int a, b;
    while(cin>>a>>b){
        cout << gcd(a,b) << ' ' << lcm(a,b) << endl;
    }
    return 0;
}

C++: #include"iostream"
using namespace std;

int main()
{
	int a,b,gcd,lcm;
	while (cin >> a >> b)
	{
		for (int i = a; i > 0; i--)
		{
			if (b%i == 0&&a%i==0)
			{
				gcd = i;
				break;
			}
		}
		for (int j = a;; j++)
		{
			if (j%a == 0 && j%b == 0)
			{
				lcm = j;
				break;
			}
		}
		cout << gcd << " " << lcm << endl;
	}
    return 0;
}