No number from 1 to 999 includes the letter "A" in its word form

A is nowhere to be found in the English spellings of the first 999 numbers. If you use just the numeral words, none of them contains the letter A.

From one thousand (1000) onwards, the names of the numbers have 'A' in their spellings. Unless you live in the U.K. where 101 = one hundred and one.