/**

* Work out the first ten digits of the sum of the following one-hundred 50-digit numbers.

*/

export function largeSum (bignum) {

const nums = []

for (let i = 0; i < bignum.length; i += 50) {

nums.push(bignum.slice(i, i + 50))

}

let pos = nums[0].length

let ret = ''

let num = 0

while (pos--) {

for (let i = nums.length; i--;) {

num += +nums[i].charAt(pos)

}

ret = num % 10 + ret

num = num / 10 | 0

}

if (num > 0) {

ret = num + ret

}

return ret.slice(0, 10)

}