#include<stdio.h>
#include<string.h>
void mult(char a[],char b[],char s[]);
main()
{
	char a[65] = "12";
	char b[65] = "12";
	char s[130] = "";
	mult(a,b,s);
	printf("%s",s);
}
void mult(char a[],char b[],char s[])
{
	int i,j,k=0,alen,blen,sum=0,res[65][65]={0},flag=0;
	char result[65];
	alen=strlen(a);
	blen=strlen(b); 
	for (i=0;i<alen;i++)
	{
		for (j=0;j<blen;j++)
		{
			res[i][j]=(a[i]-'0')*(b[j]-'0');
		}
	}
	for (i=alen-1;i>=0;i--)
	{
		for (j=blen-1;j>=0;j--)
		{
			sum=sum+res[i+blen-j-1][j];
		}
		result[k]=sum%10;
		k=k+1;
		sum=sum/10;
	}
	for (i=blen-2;i>=0;i--)
	{
		for (j=0;j<=i;j++)
		{
			sum=sum+res[i-j][j];
		}
		result[k]=sum%10;
		k=k+1;
		sum=sum/10;
	}
	if (sum!=0) 
	{
		result[k]=sum;
		k=k+1;
	}
	for (i=0;i<k;i++) 
	{
		result[i]+='0';
	}
	for (i=k-1;i>=0;i--) 
	{
		s[i]=result[k-1-i];
	}
	s[k]='\0';
	while(1)
	{
		if (strlen(s)!=strlen(a)&&s[0]=='0') 
			strcpy(s,s+1);
		else
			break;
	}
}