C Programming help!

Write a program that reads a sequence of integers until 0 and prints the second greatest value. The output will be a single number. For example, for input 2 3 5 5 0, the program prints 3. If the second greatest value does not exist, the program will print No second maximum.

Example of input: 10 2 4 5 8 3 6 0

Corresponding output: 8

Example of input: 7 7 0

Corresponding output: No second maximum