INPUT:
source=["udumalpet","coimbatore","palani","madurai","mysore","palakad"]
places={
("udumalpet","coimbatore"): 100,
("palani","madurai"):140,
("mysore","palakad"):200
}
a=str(input("Source:"))
if a in source:
b=str(input("Destionation:"))
if(a,b) in places:
print("the distance from",a,"to",b,"is",places[(a,b)],"km")
elif(b,a) in places:
print("the distance from",b,"to",a,"is",places[(a,b)], "km")
else:
print("wrong")
else:
print("enter correct source")
