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#include <iostream>

#include <string>

using namespace std;

string number;

int helper(string num){

int sz = num.size();

bool should_double = true;

int check_sum = 0;

for(int i=sz-1; i>=0; i--){

int cur_digit = num[i]-'0'; //assume all are number digits

if(should_double==1){

cur_digit *= 2;

}

should_double = !should_double;

if(cur_digit>=10){

int tmp = cur_digit%10;

tmp += (cur_digit/10)%10;

cur_digit = tmp;

}

check_sum += cur_digit;

}

return check_sum;

}

int getFullAccountNumber(string number){

int current_check_sum = helper(number);

//cout<<"current checksum = "<<current_check_sum<<endl;

int tmp = (10 - current_check_sum%10)%10;

return tmp;

}

int main(){

while(cin>>number){

int ans = getFullAccountNumber(number);

string whole_number = number;

number += (ans + '0');

cout<<"OUTPUT: "<<number<<endl;

}

return 0;

}