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ADD   = 1
PUSH  = 2
PRINT = 3

stack = []
program = ( (5, PUSH), (10, PUSH), (ADD,), (PRINT,), )

for line in program:
    if line[-1] is PUSH:
        stack.append(line[0])
    elif line[-1] is PRINT:
        print stack.pop()
    elif line[-1] is ADD:
        t = stack.pop() + stack.pop()
        stack.append(t)