Determine if a string is composed of numbers or characters

[HeliPilot]

You want ==, not = for comparison, but I'm not sure what the point of comparing anything to I is.

I get the same error, just more of them when I use ==.

The idea was to compare the first string character to the numbers 0,1,2,3...9 and if it matched any of them, the string is composed of numbers.