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#include<stdio.h>
#include<ctype.h>
#define INT_MIN -21e8
const int N=1e3+5;
int main(int argc,const char* argv[]){
	int a,b;
	
	scanf("%d %d",&a,&b);
	printf("交换两个数:\n"); 
	printf("交换前a = %d\tb = %d\n",a,b);
	a^=b;
	b^=a;
	a^=b; 
	printf("交换后a = %d\tb = %d\n",a,b);
	
	int arr[N],n;
	scanf("%d",&n);
	printf("数组输入与输出:\n"); 
	for(int i=0;i<n;i++) scanf("%d",&arr[i]);
	for(int i=0;i<n;i++) printf("%d ",arr[i]);
	putchar(10);
	
	int t=INT_MIN;
	for(int i=0;i<n;i++)
		if(arr[i]>t) t=arr[i];
	printf("数组求最大值:\n"); 
	printf("最大值是：%d\n",t);
	
	
	int cnt1=0,cnt2=0;
	char ch;
	getchar();
	printf("统计以\\n结尾的字符数:\n"); 
	while((ch=getchar())!='\n'){
		if(isdigit(ch)) cnt1++;
		else if(isalpha(ch)) cnt2++; 
	}
	printf("数字和字母数为：%d\t%d\n",cnt1,cnt2);
	
	return 0;
}