#include<stdio.h>
int main(void)
{
int f, lower,upper;
double c;
scanf("%d %d",&lower,&upper);
if(lower<=upper&&upper<=100)
{
printf("fahr celsius\n");
for(f=lower;f<=upper;f+=2)
{
c=5.0*(f-32)/9.0;
printf("%d%6.1f\n",f,c);
}
}else{
printf("Invalid.");
}
return 0;
}