Two string - Java - using integer to store 26 chars - each char one bit

Twostring2.java

import java.io.*;

public class HR_two_strings {

    public static void solve(Input in, PrintWriter out) throws IOException {
        int tests = in.nextInt();
        for (int test = 0; test < tests; ++test) {
            String a = in.next();
            String b = in.next();
            if ((f(a) & f(b)) != 0) {
                out.println("YES");
            } else {
                out.println("NO");
            }
        }
    }

    private static int f(String a) {
        int r = 0;
        for (char c : a.toCharArray()) {
            r |= 1 << (c - 'a');
        }
        return r;
    }

    public static void main(String[] args) throws IOException {
        PrintWriter out = new PrintWriter(System.out);
        solve(new Input(new BufferedReader(new InputStreamReader(System.in))), out);
        out.close();
    }

    static class Input {
        BufferedReader in;
        StringBuilder sb = new StringBuilder();

        public Input(BufferedReader in) {
            this.in = in;
        }

        public Input(String s) {
            this.in = new BufferedReader(new StringReader(s));
        }

        public String next() throws IOException {
            sb.setLength(0);
            while (true) {
                int c = in.read();
                if (c == -1) {
                    return null;
                }
                if (" \n\r\t".indexOf(c) == -1) {
                    sb.append((char)c);
                    break;
                }
            }
            while (true) {
                int c = in.read();
                if (c == -1 || " \n\r\t".indexOf(c) != -1) {
                    break;
                }
                sb.append((char)c);
            }
            return sb.toString();
        }

        public int nextInt() throws IOException {
            return Integer.parseInt(next());
        }

        public long nextLong() throws IOException {
            return Long.parseLong(next());
        }

        public double nextDouble() throws IOException {
            return Double.parseDouble(next());
        }
    }
}