sum.c

#include <stdio.h>

int main() {
	char A[200];
	char B[200];
	char T[200];
	size_t lenA,lenB,maxLen;
	int i;
	int digitA,digitB,digitH,carry;
	
	scanf("%s",A);lenA = strlen(A);
	scanf("%s",B);lenB = strlen(B);
	if (lenB>lenA)
	{
		maxLen = lenB;
		for (i=0; i<maxLen-lenA; i++)
			T[i] = '0';
		for (i=maxLen-lenA; i<maxLen; i++)
			T[i] = A[lenA-maxLen+i];
		T[maxLen] = '\0';
		printf("%s\n",T);
		printf("%s\n",B);
	}
	else
	{
		maxLen = lenA;
		for (i=0; i<maxLen-lenB; i++)
			T[i] = '0';
		for (i=maxLen-lenB; i<maxLen; i++)
			T[i] = B[lenB-maxLen+i];
		T[maxLen] = '\0';
		printf("%s\n",A);
		printf("%s\n",T);
	}
	
	return 0;
}