const input = require('fs').readFileSync('/dev/stdin', 'utf8').replace(/^ｗ+|\n/, '')
console.log(input.includes('ｗ') && --[...new Set([...input])].length ? input.match(new RegExp(`[^ｗ]+ｗ{${Math.max(...input.match(/ｗ+/g).map(v => v.length))}}`, 'g')).map(v => v.replace(/ｗ/g, '')).join('\n') : '');