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/**

* 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)

}