#include<iostream>
using namespace std;

int main()
{
	int a,b,c;
	cout<<"a="; cin>>a;
	cout<<"b="; cin>>b;
	cout<<"c="; cin>>c;
	if(a<=b && b<=c) cout<<a<<" "<<b<<" "<<c;
	else if(a<=c && c<=b) cout<<a<<" "<<c<<" "<<b;
	else if(b<=a && a<=c) cout<<b<<" "<<a<<" "<<c;
	else if(b<=c && c<=a) cout<<b<<" "<<c<<" "<<a;
	else if(c<=a && a<=b) cout<<c<<" "<<a<<" "<<b;
	else if(c<=b && b<=a) cout<<c<<" "<<b<<" "<<a;
	return 0;
}

sau 

#include<iostream>
using namespace std;

int main()
{
	int a,b,c,aux;
	cout<<"a="; cin>>a;
	cout<<"b="; cin>>b;
	cout<<"c="; cin>>c;
    if(a>b) { aux=a; a=b; b=aux; }
	if(a>c) { aux=a; a=c; c=aux; }
	if(b>c) { aux=b; b=c; c=aux; }
	cout<<a<<" "<<b<<" "<<c;
	return 0;
}