Program$2.$Write a program to determine the drink size based on the letter the user enters.$$Print a message to the user giving the various drink size options and then prompt the user for the drink size.$$The user can enter$$ an $$s$$ or $$S$$ for small, an $$m$$ or $$M$$ for medium, and an $$l$$ or $$L$$ for large.$$Depending on which size the$$ user requests, print a message such as: $$You have ordered a $($small$,$ medium, large$)$ drink.$$ In addition to$$ displaying the size ordered, also record a price multiplier.$$The price multiplier for a small is $1,$ for a$$ medium is $2,$ and for a large is $3.$If the user does not enter a valid character, print an error message$($such as $$Error: Invalid drink size$)$ and exit the program.$$ You should use nested if$$then$$else statements for this problem.$$After the nested if$$then$$else statements, print the value of the price multiplier to ensure that the correct value was recorded $($the$$ price multiplier will be used in program $4).$Hint: use the logical OR expression in your comparisons.$$