#include <stdio.h>
#include <ctype.h>

char chars[] = {
    'A',
    '5',
    '$',
    'Z'
};

#define SIZE sizeof( chars ) / sizeof( char )

void main()
  {
    int   i;

    for( i = 0; i < SIZE; i++ ) {
        printf( "%c ", tolower( chars[ i ] ) );
    }
    printf( "\n" );
  }