const input = require('fs').readFileSync('/dev/stdin', 'utf8');
const S = input.split('\n')[0];
const COUNT = {
  West: 0,
  East: 0
};
for (let i = 2; i < S.length; i++) {
  if (S[i - 2] == S[i - 1] && S[i - 1] == S[i]) {
    console.log(S[i] == 'O' ? 'East' : 'West');
    break;
  } else if (i == S.length - 1) {
    console.log('NA');
  }
}