const fs = require('fs');

// const inputArray = fs.readFileSync('sample.txt').toString().split("\n");
const inputArray = fs.readFileSync('input.txt').toString().split("\n");
const buffer = inputArray[0];

// Part One

for (let i = 4; i < buffer.length; i++) {
  const chars = buffer.substring(i-4, i).split("");
  let unique = [...new Set(chars)];
  if (unique.length === 4) {
    console.log(i)
    break;
  }
}


// Part Two

for (let i = 14; i < buffer.length; i++) {
  const chars = buffer.substring(i-14, i).split("");
  let unique = [...new Set(chars)];
  if (unique.length === 14) {
    console.log(i)
    break;
  }
}