#include<stdio.h>
#include<ctype.h>
void main(void)
{ 
	char c,c1,c2,top;
	int i;
	printf("input a character:\n");
	top=isupper(c=getchar())?'A':(islower(c)?'a':'\0');
	if(top)
	{ 
		for(c1=top;c1<=c;++c1)
		{ 
			for(i=1;i<=40-2*(c1-top);++i) 
				putchar(' ');
			for(c2=top;c2<=c1;++c2) 
				printf("%2c",c2);
			for(c2=c1-1;c2>=top;--c2) 
				printf("%2c",c2);
			printf("\n");
		}
	}
}