#include <bits/stdc++.h>

#define _overload(_1,_2,_3,name,...) name
#define _rep(i,n) _range(i,0,n)
#define _range(i,a,b) for(int i=int(a);i<int(b);++i)
#define rep(...) _overload(__VA_ARGS__,_range,_rep,)(__VA_ARGS__)

using namespace std;
using ll=long long;

const int limit=2000000;

const int num_idx[10]={0,0,1,0,2,5,0,4,3,0};
const int two_idx[6]={1,2,4,8,7,5};

vector<char> s[limit];

int main(void){
    int t=0,c,i=0;
    while(c=getchar_unlocked(),c!='\n') t=10*t+c-'0'; 
    while(i<t){
        c=getchar_unlocked();
        s[i].emplace_back(c);
        if(c=='\n') i++;
    }

    rep(loop,t){
    	int n=s[loop].size();
    	
        if(n==1){
            putchar_unlocked(s[loop][0]);
            putchar_unlocked('\n');
            continue;
        }

        bool allzero=true;
        rep(i,n) if(s[loop][i]!='0') allzero=false;
        
        if(allzero){
            putchar_unlocked('0');
            putchar_unlocked('\n');
            continue;
        }

        ll ans=0,num=n-1,den=1,two=0,three=0,tmp;

        rep(i,n/2){
            if(three<=1){
                ll cur=s[loop][i]-'0'+s[loop][n-1-i]-'0';
                cur=cur*two_idx[two%6]*(three?3:1);
                ans+=cur;
            }
            
            tmp=num;
            while(tmp%3==0) tmp/=3LL,three++;
            two+=(num_idx[tmp%9]);
            
            tmp=den;
            while(tmp%3==0) tmp/=3LL,three--;
            two+=(6-num_idx[tmp%9]);
        
            num--,den++;
        }

        if(n/2 == (n-1-n/2) && three<=1){
        	ll cur=s[loop][n/2]-'0';
            cur=cur*two_idx[two%6]*(three?3:1);
            ans+=cur;
        }

        ans%=9;
        if(ans==0) ans=9;
        ans+='0';
        putchar_unlocked(char(ans));
        putchar_unlocked('\n');
    }
    return 0;
}