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# 8.7 (Phone keypads) The international standard letter/number mapping for telephones is
# Write a function that returns a number, given an uppercase letter, as follows:
# def getNumber(uppercaseLetter):
# Write a test program that prompts the user to enter a phone number as a string.
# The input number may contain letters.The program translates a letter(uppercase or lowercase)
# to a digit and leaves all other characters intact.
def getNumber(uppercaseLetter):
if 'A' <= uppercaseLetter <= 'C':
return 2
elif 'D' <= uppercaseLetter <= 'F':
return 3
elif 'G' <= uppercaseLetter <= 'I':
return 4
elif 'J' <= uppercaseLetter <= 'L':
return 5
elif 'M' <= uppercaseLetter <= 'O':
return 6
elif 'P' <= uppercaseLetter <= 'S':
return 7
elif 'T' <= uppercaseLetter <= 'V':
return 8
elif 'W' <= uppercaseLetter <= 'Z':
return 9
def main():
s = input("Enter a string: ")
res = ''
for c in s:
if c.isalpha():
c = getNumber(c.upper())
res = res + str(c)
print(res)
main()
