stack = []

stack.append("A")
stack.append("B")
stack.append("C")
stack.append("D")
stack.append("E")
stack.append("F")
stack.append("G")
stack.append("H")
stack.append("I")
stack.append("J")
stack.append("K")
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.append("L")
stack.append("M")
stack.append("N")
stack.pop()
stack.append("O")
stack.append("P")
stack.append("Q")
stack.append("R")
stack.pop()
stack.pop()
stack.pop()
stack.append("S")
stack.append("T")
stack.append("U")
stack.append("V")
stack.append("W")
stack.append("X")
stack.append("Y")
stack.append("Z")
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()
stack.pop()

print(stack)