
    Write a function that generates a single-letter risk category (A-Z) for patient cases by processing their medical identifier string, where the letter is determined by summing the ASCII values of all characters in the patient's concatenated medical history code and taking the result modulo 26. This derived category letter will serve as a rapid triage indicator in the hospital's risk assessment protocol.
    

    
def get_Char(strr):
    """
    Write a function that generates a single-letter risk category (A-Z) for patient cases by processing their medical identifier string, where the letter is determined by summing the ASCII values of all characters in the patient's concatenated medical history code and taking the result modulo 26. This derived category letter will serve as a rapid triage indicator in the hospital's risk assessment protocol.
    

    """
def get_Char(strr):
    """
    Write a function that generates a single-letter risk category (A-Z) for patient cases by processing their medical identifier string, where the letter is determined by summing the ASCII values of all characters in the patient's concatenated medical history code and taking the result modulo 26. This derived category letter will serve as a rapid triage indicator in the hospital's risk assessment protocol.
    

    """
    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)