08. Letters Change Numbers

string = input().split()
result = 0

for el in string:
    digits = ''
    letters = ''

    for char in el:
        if char.isdigit():
            digits += char
        else:
            letters += char

    if letters[0].islower():
        current_result = int(digits) * (ord(letters[0].upper()) - 64)
    else:
        current_result = int(digits) / (ord(letters[0].upper()) - 64)

    if letters[1].islower():
        current_result += (ord(letters[1].upper()) - 64)
    else:
        current_result -= (ord(letters[1].upper()) - 64)

    result += current_result

print(f'{result:.2f}')