#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};

char s[2*limit+1];
char ans[2*limit+1];

int main(void){
    int t=0,c,offset=0,len=0;
    while(c=getchar_unlocked(),c!='\n') t=10*t+c-'0'; 
    fread(s,1,2*limit+1,stdin);

    rep(loop,t){
        int n=0;
        while(s[offset+n]!='\n') n++;
    	
        if(n==1){
            ans[len++]=s[offset];
            ans[len++]='\n';
            offset+=n+1;
            continue;
        }

        bool allzero=true;
        rep(i,n) if(s[offset+i]!='0') allzero=false;
        
        if(allzero){
            ans[len++]='0';
            ans[len++]='\n';
            offset+=n+1;
            continue;
        }

        int answer=0,num=n-1,den=1,two=0,three=0,tmp;

        rep(i,n/2){
            if(three<=1){
                int cur=s[offset+i]-'0'+s[offset+n-1-i]-'0';
                cur=cur*two_idx[two%6]*(three?3:1);
                answer+=cur;
            }
            
            tmp=num;
            if(tmp%6561==0) tmp/=6561,three+=8;
            if(tmp%81==0) tmp/=81,three+=4;
            if(tmp%9==0) tmp/=9,three+=2;
            if(tmp%3==0) tmp/=3,three+=1;
            two+=(num_idx[tmp%9]);
            
            tmp=den;
            if(tmp%6561==0) tmp/=6561,three-=8;
            if(tmp%81==0) tmp/=81,three-=4;
            if(tmp%9==0) tmp/=9,three-=2;
            if(tmp%3==0) tmp/=3,three-=1;
            two+=(6-num_idx[tmp%9]);
        
            num--,den++;
        }

        if(three<=1 && ((n>>1) == (n-1-(n>>1)))){
            int cur=s[offset+(n>>1)]-'0';
            cur=cur*two_idx[two%6]*(three?3:1);
            answer+=cur;
        }

        answer%=9;
        if(answer==0) answer=9;
        ans[len++]=answer+'0';
        ans[len++]='\n';
        offset+=n+1;
    }
    ans[len]='\0';
    fwrite(ans,1,len,stdout);
    return 0;
}