1. Data Type (another solution)

def type_int(symbol):
    num = int(symbol)
    return num * 2


def type_real(symbol):
    num = int(symbol)
    return num * 1.5


def type_string(symbol):
    greeting = '$' + symbol + '$'
    return greeting


type_line = input()
new_symbol = input()
if type_line == "int":
    print(type_int(new_symbol))
if type_line == "real":
    print(f"{type_real(new_symbol):.2f}")
if type_line == "string":
    print(type_string(new_symbol))