Write a function that accepts a string and returns the second highest numerical digit in the input as an integer.

The following rules should apply:

• Inputs with no numerical digits should return -1
• Inputs with only one numerical digit should return -1
• Non-numeric characters should be ignored
• Each numerical input should be treated individually, meaning in the event of a joint highest digit then the second highest digit will also be the highest digit

For example:

• "abc:1231234" returns 3
• "123123" returns 3

• [execution time limit] 0.5 seconds (cpp)

• [input] string input

  The input string

• [output] integer

  The second-highest digit