#include "stdio.h"
#include "string.h"
void compare(int* x,int* y);
int main()
{
int a,b,c,d;
scanf("%d",&a);
scanf("%d",&b);
scanf("%d",&c);
scanf("%d",&d);
compare(&a,&b);
compare(&a,&c);
compare(&a,&d);
compare(&b,&c);
compare(&b,&d);
compare(&c,&d);
printf("%d",a);
printf("%d",b);
printf("%d",c);
printf("%d",d);
}
void compare(int* x,int* y)
{
int temp;
if(*x < *y)
{
temp = *y;
*y = *x;
*x = temp;
}
}
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