My programme should exit after insert wrong input

Question

I just started learn python i wrote this program i dont know how to be programe exit after insert wrong input like when we enter our name “meet” but i entered “45” my programe should exit here by giving “u press wrong key” pls help me
My code is

#welcome line of sbi bank atm for custmer
print("HI WELCOME TO SBI BANK ATM")
#we will ask name for the custmer
name = input(str("PLEASE ENTER YOUR NAME?\n "))

print("NICE TO MEET YOU,", name)
#now we will ask for the age and this is a caution for age!!!!!!
print(''' As students are always on the run and are
usually deprived to free time, this account and debit
card gives them the freedom from visiting the bank branch
for making transactions. Youth Debit Card: Youth Debit Card
is offered to people between the age of 18 years to 25 years. ''')

#what is the age
age = input("WHAT IS YOUR age?\n ")
age = int(age)
if(age>18):

print("YOU CAN GET MONEY")
elif age==18:
print("you can get money")

else:
print("SORRY YOU CAN'T GET MONEY")

print("CONGRATION! YOU CAN GET MONEY!", name)
#ask for mobile number
mobile = input("PLEASE ENTER YOUR MOBILE NUMBER?\n ")

#now we will ask for account number
account = input("PLEASE ENTER YOUR 11 DIGIT ACCOUNT NUMBER? ")

print("THANK YOU", name)
#here is amount page
print('''100 200 500
2000 CUSTOM''')
#ENTER MONEY
money = input("PLEASE ENTER YOUR AMOUNT= ")

print("PLEASE COLLECT YOUR CASH", name)

print("THANKS FOR VISITING HERE GOOD DAY", name)

print("good life")

Answer 1

Hi,
for a good exit you should put it all into a function.
it is.

def greeting() :
#all your code here

greeting()

now for exit it is a simple
return
to leave

Answer 2

Oh, man! There are a lot of things you can write better.
But if to answer your question,
if name.isalpha():
Blabla
if age.isdigit():
Blabla

Answer 3

So you want your program to exit if the name input contains any integers? I am trying to understand the request a little better