process.stdin.resume();
process.stdin.setEncoding('utf8');

process.stdin.on('data', function (chunk) {
    var str = chunk.toString().split('\n')[0];
    var ans = "NA";
    for(var i=0; i<=str.length-3; i++) {
        if(str[i] == str[i+1] && str[i] == str[i+2]) {
            if(str[i] == 'O') {
                ans = "East";
            } else {
                ans = "West";
            }
            break;
        }    
    }
    console.log(ans);
});