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import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.PushbackInputStream;
class PushbackInputStreamDemo {
public static void main(String args[]) throws IOException {
String s = "if (a == 4) a = 0;\n";
byte buf[] = s.getBytes();
ByteArrayInputStream in = new ByteArrayInputStream(buf);
PushbackInputStream f = new PushbackInputStream(in);
int c;
while ((c = f.read()) != -1) {
switch (c) {
case '=':
if ((c = f.read()) == '=')
System.out.print(".eq.");
else {
System.out.print("<-");
f.unread(c);
}
break;
default:
System.out.print((char) c);
break;
}
}
}
}
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