// yukicoder: No.432 占い(Easy)
// 2019.4.17 bal4u

#include <stdio.h>

#if 1
#define gc() getchar_unlocked()
#define pc(c) putchar_unlocked(c)
#else
#define gc() getchar()
#define pc(c) putchar(c)
#endif
int in()
{
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf), c = gc(); while (c >= '0');
	return n;
}

int ins(char *s)
{
	char *p = s, c;
	do c = gc(), *s++ = c & 0xf;
	while (c > ' ');
	*--s = 0;
	return s-p;
}

char S[1004];
int tbl[10][10];

int main()
{
	int i, j, k, s, w, T;
	for (i = 0; i <= 9; i++) for (j = i; j <= 9; j++) {
		k = i + j, s = 0;
		while (k) s += k % 10, k /= 10;
		tbl[i][j] = tbl[j][i] = s;
	}

	T = in();
	while (T--) {
		w = ins(S);
		while (--w) {
			for (i = 0; i < w; i++) S[i] = tbl[S[i]][S[i+1]];
		}
		pc('0'+S[0]), pc('\n');
	}
	return 0;
}