# Write a Python program to check if a string has at least one letter and one number def checkString(str):        # intializing flag variable    flag_l = False    flag_n = False          # checking for letter and numbers in     # given string    for i in str:                # if string has letter        if i.isalpha():            flag_l = True          # if string has number        if i.isdigit():            flag_n = True          # returning and of flag    # for checking required condition    return flag_l and flag_n    # driver codeprint(checkString('thishasboth29'))print(checkString('geeksforgeeks'))