
    Write a function that generates a validation checksum character for a bus route identifier by summing the ASCII values of all characters in the route code string (containing line number, stop codes, and time indicators) and applying modulo 26 to the sum to produce a single letter verification code.
    

    
def get_Char(strr):
    """
    Write a function that generates a validation checksum character for a bus route identifier by summing the ASCII values of all characters in the route code string (containing line number, stop codes, and time indicators) and applying modulo 26 to the sum to produce a single letter verification code.
    

    """
def get_Char(strr):
    """
    Write a function that generates a validation checksum character for a bus route identifier by summing the ASCII values of all characters in the route code string (containing line number, stop codes, and time indicators) and applying modulo 26 to the sum to produce a single letter verification code.
    

    """
    summ = 0
    for i in range(len(strr)):
        summ += ord(strr[i]) - ord('a') + 1
    if summ % 26 == 0:
        return ord('z')
    else:
        summ = summ % 26
        return chr(ord('a') + summ - 1)