I$\text{'}$m having difficulty with strings in for loops in C$++$

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String passPhrase is read from input. For each character in passPhrase that is a letter, increment count by $1.$ Then, output "Valid"

if count is less than $6$ and passPhrase's length is greater than $5.$ Otherwise, output "Invalid". End each output with a newline.

grad Click for examples

Ex $1$: If the input is yZsXD$6,$ then the output is:

Valid

Ex $2$: If the input is s$6$FmW$,$ then the output is:

Invalid

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

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