let input = ['-78.4-2'];


let print = this.print || console.log;
let gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);



let inputOne = gets().split('');

// if (inputOne[0] === '-') {

//     inputOne.shift();

// }


inputOne = inputOne.map(Number);
console.log(inputOne)

let sum = 0;

let sum2 = 0;

let str = [];


for (let i = 0; i < inputOne.length; i++) {
    if (!isNaN(inputOne[i])) {
        sum += inputOne[i];
    }


}
console.log(sum);

while (sum > 9) {

    str = sum.toString();

    str = str.split('').map(Number);
    console.log(str);

    sum = 0;

    for (let j = 0; j < str.length; j++) {


        sum = sum + str[j];

    }

}

print(sum);