#include
#include
#include
#define MAX 1000
#define LEN 20
void Input (char *a, char *b, char *c){
gets(a);
gets(b);
gets(c);
}
void Swap (char *str, char *FindWord, char *SwapWord){
int j,s,k,i=0,SwapWordLength,strLength,FindWordLength,n;
char *p1,*p2;
p1=str;
p2=FindWord;
strLength=strlen(str); //length of the original sentence
FindWordLength=strlen(FindWord); //length of the old word
SwapWordLength=strlen(SwapWord); //length of the new word
n=SwapWordLength-FindWordLength;
while(*p1!=' '){
if((*p1==*p2)&&(!isalpha(*(p1-1)))) //isalpha : judge whether the char_c is an english word or not,if yes return !0,if no return 0
while((*p1==*p2)&&(*p2!=' '))
{ p1++; p2++; i++; } //i: record how many chars has been read
else { p1++; i++; }
if((*p2==' ')&&(isalpha(*p1)==0)){
//find the old word in the sentence
if(n
