import os

# Clear screen
os.system("clear") # Mac or Linux
#os.system("cls") # Windows

userInput = input("Input a string with both letters and digits: ")

# Variables for counting letters and numbers
letters = 0
digits = 0

# Iterate string character by character
for i in userInput:
    # If character is a letter, increase letters counter
    if i.isalpha():
        letters += 1
    # If character is a number, increate number counter
    elif i.isdigit():
        digits += 1

print("User input has", letters, "letters and", digits, "digits in it.")