#include<stdio.h>
int main()
{
int c,r,feet,head,leap=0;
scanf("%d %d",&head,&feet);
for(c=0;c<=head;c++){
for(r=0;r<=head;r++){
if(r+c==head&&r*4+c*2==feet){
leap=1;break;
}
}
}
if(leap) printf("chickens = %d; rabbits = %d",c,r);
else printf("No solution!");
return 0;
}