#include<stdio.h>#include<string.h>#define SIZE 41int main () {		char str[SIZE];	char order[5];	//命令格式最長需要的空間最大5 	int i;	char judge;	//命令的方式符 	char a,b;	//D只需要a，其他需要a，b 	int len;	gets(str);	gets(order);	judge = order[0];	if(judge == 'D'){		a = order[2];	} else {		a = order[2];		b = order[4];	}	len = strlen(str);		if(judge == 'D'){	//D		int temp = 0;		for(i = 0; i < len; i ++){			if(temp == 0 && str[i] == a){				temp = 1;			} else {				PRintf("%c",str[i]);			}		}	} else if(judge == 'I'){	//I		int num = -1;		for(i = 0; i < len; i ++){			if(str[i] == a){				num = i;			}		}		for(i = 0; i < len; i ++){			if(i == num){				printf("%c",b);			}			printf("%c",str[i]);		}	} else {	//R		for(i = 0; i < len; i ++){			if(str[i] == a)				printf("%c", b);			else				printf("%c",str[i]);		}	}			return 0;}