
    Write a function that generates a single verification character from a mobile banking security token by summing the ASCII values of all characters in the biometric token string and performing modulo 26 on the result. The resulting character will serve as the final verification digit for high-value transaction authentication in the mobile banking app.
    

    
def get_Char(strr):
    """
    Write a function that generates a single verification character from a mobile banking security token by summing the ASCII values of all characters in the biometric token string and performing modulo 26 on the result. The resulting character will serve as the final verification digit for high-value transaction authentication in the mobile banking app.
    

    """
def get_Char(strr):
    """
    Write a function that generates a single verification character from a mobile banking security token by summing the ASCII values of all characters in the biometric token string and performing modulo 26 on the result. The resulting character will serve as the final verification digit for high-value transaction authentication in the mobile banking app.
    

    """
    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)