#include <stdio.h>
int main()
{
int lower,upper,fahr;
float celsius;
scanf("%d %d",&lower,&upper);
fahr=lower;
if(lower<=upper && upper<=100)
{
printf("fahr celsius\n");
while(fahr<=upper)
{
celsius = 5 * (fahr - 32.0) / 9;
printf("%d %6.1lf\n",fahr,celsius);
fahr=fahr+2;
}
}
else {
printf("Invalid.\n");
}
return 0;
}