/*

 * Copyright (c) 1997, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/**/

import java.io.Reader;

class ABCReader extends Reader {

    int len;

    int count = 0;

    char next = 'a';

    ABCReader(int len) {

        this.len = len;

    }

    public int read() {

        if (count >= len)

            return -1;

        char c = next;

        if (next == 'z')

            next = '0';

        else if (next == '9')

            next = 'a';

        else

            next++;

        count++;

        return c;

    }

    public int read(char cbuf[], int off, int len) {

        for (int i = off; i < off + len; i++) {

            int c = read();

            if (c == -1) {

                if (i > off)

                    return i - off;

                else

                    return -1;

            }

            cbuf[i] = (char) c;

        }

        return len;

    }

    public void close() {

        len = 0;

    }

}