#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__)

#define _rrep(i,n) _rrange(i,n,0)
#define _rrange(i,a,b) for(int i=int(a)-1;i>=int(b);--i)
#define rrep(...) _overload(__VA_ARGS__,_rrange,_rrep,)(__VA_ARGS__)

using namespace std;


char s[100010];

int main(void){
	int t,all=0;
	scanf("%d",&t);

	rep(loop,t){
		scanf("%s",s);
		int n=strlen(s);
		assert(1<=n);
		rep(i,n) assert(isdigit(s[i]));
		
		vector<int> seq[2];

		rep(i,n) seq[0].push_back(s[i]-'0');

		bool allzero=true;
		rep(i,n) if(seq[0][i]!=0) allzero=false;
		
		if(allzero){
			puts("0");
			continue;
		}

		int cur=0,nxt=1;
		while(seq[cur].size()>=2){
			seq[nxt].clear();
			int m=seq[cur].size();
			rep(i,m-1) seq[nxt].push_back((seq[cur][i]+seq[cur][i+1])%9);
			swap(cur,nxt);
		}

		int ans=seq[cur][0];
		if(ans==0) ans=9;
		printf("%d\n",ans);
	}
	assert(all<=100000);
	return 0;
}