
    Write a function that generates a single-character transaction fingerprint by converting a credit card transaction signature into its corresponding checksum character, where the checksum is calculated by summing the ASCII values of all characters in the signature and taking modulo 26 to map it to an alphabetic character. This fingerprint will be used as part of the fraud detection system to quickly identify suspicious transaction patterns.
    

    
def get_Char(strr):
    """
    Write a function that generates a single-character transaction fingerprint by converting a credit card transaction signature into its corresponding checksum character, where the checksum is calculated by summing the ASCII values of all characters in the signature and taking modulo 26 to map it to an alphabetic character. This fingerprint will be used as part of the fraud detection system to quickly identify suspicious transaction patterns.
    

    """
def get_Char(strr):
    """
    Write a function that generates a single-character transaction fingerprint by converting a credit card transaction signature into its corresponding checksum character, where the checksum is calculated by summing the ASCII values of all characters in the signature and taking modulo 26 to map it to an alphabetic character. This fingerprint will be used as part of the fraud detection system to quickly identify suspicious transaction patterns.
    

    """
    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)