So it is the Programmers' Day :)
My first program in 1992 year was something like that:
10 INPUT "Temperature in Fahrenheit: "; F
20 LET C = Int((F + 40) * 5 / 9 - 40)
30 PRINT "Temperature in Celsius: " + C
40 INPUT "Again (Y/N)"; S$
50 IF S$="y" OR S$="Y" THEN GOTO 10
Do you know the languge it is writen on?