C :

#include<stdio.h>
#include<stdlib.h>

int main()
{
	int j;
	int n;
	scanf("%d", &n);
	int *a = (int *)malloc(n*sizeof(int));
	int *b = (int *)malloc(n*sizeof(int));
	int *ans = (int *)malloc(n*sizeof(int));
	for(j = 0; j < n; j++)
	{
		scanf("%d%d", &a[j], &b[j]);
		ans[j] = 0;
	}
	for(j = 0; j < n; j++)
	{
		int c = 0;
		for(int i = 9; i >= 0; i--)
		{
			c = (a[j]%10 + b[j]%10 + c) > 9 ? 1 : 0;
			ans[j] += c;
			a[j] /= 10;
			b[j] /= 10;
		}
	}
	for(j = 0; j < n; j++)
	{
		printf("%d\n", ans[j]);
	}
	free(a);
	free(b);
	free(ans);
	return 0;
}