
    Write a function that generates a single-character security checksum from a transaction's behavioral fingerprint by summing the ASCII values of each encoded metric in the fingerprint string and applying modulo 26 to the result. The resulting character serves as a quick validation token for the transaction's legitimacy in the fraud detection pipeline.
    

    
def get_Char(strr):
    """
    Write a function that generates a single-character security checksum from a transaction's behavioral fingerprint by summing the ASCII values of each encoded metric in the fingerprint string and applying modulo 26 to the result. The resulting character serves as a quick validation token for the transaction's legitimacy in the fraud detection pipeline.
    

    """
def get_Char(strr):
    """
    Write a function that generates a single-character security checksum from a transaction's behavioral fingerprint by summing the ASCII values of each encoded metric in the fingerprint string and applying modulo 26 to the result. The resulting character serves as a quick validation token for the transaction's legitimacy in the fraud detection pipeline.
    

    """
    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)