import { readFileSync } from 'fs';
import { join } from 'path';

const fileString = readFileSync(join(__dirname, "input"), 'utf-8');

for (var i = 0; i < fileString.length; i++) {
  const win = fileString.slice(i, i + 14);
  const swin = new Set<string>(win);
  if (swin.size == 14) {
    console.log(i + 14);
    break;
  }
}