Read from standard input a text consisting of multiple lines. Determine and print on a single line, separated by spaces:
1. the number of lines read; 2. the number of words (a word is a maximal sequence of English letters a-z or A-Z); 3. the total number of letters in the text.
Digits and punctuation are not letters and cannot be part of a word.
Data is read from standard input (in the format described), not from a file. Reading proceeds line by line until end of input.