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import fileinput
stack = []
error = "Stack is empty"
for line in fileinput . input ():
chunks = line . split ()
command = chunks [0]
if command == "push":
stack . append (int (chunks [1]))
if command == "pop":
if len (stack):
stack . pop ()
if command == "top":
if len (stack):
print stack [len (stack) - 1]
else:
print error
if command == "min":
if len (stack):
print min (stack)
else:
print error
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