c$++$ String checkStr is read from input. For each character in checkStr that is a digit, increment count by $1.$ Then, output "Valid" if count is more than $3$ and checkStr's length is greater than or equal to $8.$ Otherwise, output "Invalid". End each output with a newline.

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Ex $1$: If the input is Qt$0$l$251$c$,$ then the output is:

Valid

Ex $2$: If the input is kBt$4$Whx$,$ then the output is:

Invalid

Note: isdigit$()$ returns true if a character is a digit, and false otherwise. Ex: isdigit$(\text{'}8\text{'})$ returns true. isdigit$(\text{'}$a$\text{'})$ returns false.