Write a program that takes a person's age and citizenship status $($citizen $-1$ or non$-$citizen $-0)$ as input and determines whether they are eligible to vote based on the following conditions:

If the person is a citizen and $18$ years or older, print "rou are eligible to vote".

If the person is a non$-$citizen, print "only citizens are eligible to vote".

If the person is younger than $18,$ print "You must be $18$ years on older to vote".