const lines = require('fs')
  .readFileSync('/dev/stdin', 'utf-8')
  .trim().split('\n').values();

const C = lines.next().value + lines.next().value;

let ans = 0, seq = 0;

for (let c of C) {
  if (c === 'x') {
    seq = 0;
  } else {
    seq++;
  }
  ans = Math.max(ans, seq);
}

console.log(ans);