const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void async function () {
    // Write your code here
    const arr = (await readline()).split(" ")
    for(i=0;i<arr.length;i++){
        if(arr[i] === "1") console.log(i+1)
    }
}()