function solve(inp) {

  function shaking(inp) {

    let str = inp.shift();

    let subStr = inp.shift();

    while (true) {

      let regEx = new RegExp(subStr, 'g');

      if (str.match(regEx) === null) {

        console.log('No shake.');

        break;

      }

      if (str.match(regEx).length >= 2) {

        str = shakingFirstAndLast(str, subStr);

        subStr = removingFromSubStr(subStr);

        if (subStr.length === 0) {

          console.log('No shake.');

          break;

        }

      } else {

        console.log('No shake.');

        break;

      }

    }

    return str;

  }



  function shakingFirstAndLast(str, subStr) {

    let before = str.substring(0, str.indexOf(subStr));

    let after = str.substring(str.indexOf(subStr) + subStr.length);

    str = before + after;

    let before2 = str.substring(0, str.lastIndexOf(subStr));

    let after2 = str.substring(str.lastIndexOf(subStr) + subStr.length);

    str = before2 + after2;

    console.log('Shaked it.');

    return str;

  }



  function removingFromSubStr(subStr) {

    let index = Math.floor(subStr.length / 2);

    let before3 = subStr.substring(0, index);

    let after3 = subStr.substring(index + 1);

    subStr = before3 + after3;

    return subStr;

  }



  console.log(shaking(inp));


}


solve(

  [

    'astalsastavisasta baby',

    'sta'

  ]

);


// solve(

//   [

//     '##mtm!!mm.mm*mtm.#',

//     'mtm'

//   ]

// );