def alpha$\_$length$($string$)$:

character $=""$

count$\_$alpha $=0$

# Complete the for loop sequence to iterate over "string".

for $\_\_\_$:

# Complete the if$-$statement using a string method.

if $\_\_\_$:

count$\_$alpha $+=1$

return count$\_$alpha

print$($alpha$\_$length$("$This has $1$ number in it$"))$ # Should print $17$

print$($alpha$\_$length$("$Thisisallletters$"))$ # Should print $16$

print$($alpha$\_$length$("$This one has punctuation!"$))$ # Should print $21$