function Main(input) { let src = input.split("\n"); const a = [...src[0]]; const s = [...src[1]]; const aMap = new Map(); let ans = ""; let i = 0; a.forEach(c => { aMap.set(i++, c); }); s.forEach(c => { if (isNaN(c)) { ans = ans + c; } else { ans = ans + aMap.get(parseInt(c)); } }); console.log(ans); } Main(require("fs").readFileSync("/dev/stdin", "utf8")); // Map練習