freq maintains frequency of each character in word
int [ ] freq = new int [ 27 ] ; for ( int i = 0 ; i < 27 ; i ++ ) freq [ i ] = 0 ; long vowel = 0 , consonant = 0 ; for ( int i = 0 ; i < word . Length ; i ++ ) { freq [ word [ i ] - ' A ' ] ++ ;