
    Write a function that generates a single-character validation code for patient records by taking a standardized patient identifier string, summing the ASCII values of all its characters, and converting the sum to a letter (A-Z) using modulo 26 arithmetic. This validation code serves as a quick verification marker for patient record integrity in the hospital's readmission tracking system.
    

    
def get_Char(strr):
    """
    Write a function that generates a single-character validation code for patient records by taking a standardized patient identifier string, summing the ASCII values of all its characters, and converting the sum to a letter (A-Z) using modulo 26 arithmetic. This validation code serves as a quick verification marker for patient record integrity in the hospital's readmission tracking system.
    

    """
def get_Char(strr):
    """
    Write a function that generates a single-character validation code for patient records by taking a standardized patient identifier string, summing the ASCII values of all its characters, and converting the sum to a letter (A-Z) using modulo 26 arithmetic. This validation code serves as a quick verification marker for patient record integrity in the hospital's readmission tracking system.
    

    """
    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)