Second highest in sequence
Problem
The sequence consists of different natural numbers and ends with the number 0. Determine the value of the second largest element in this sequence.
Input
A sequence of natural numbers is entered, ending with the number 0 (the number 0 itself is not included in the sequence, but serves as a sign of its termination).
Imprint
Output the answer to the problem
Examples
Запрещенные операторы: list
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