#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char a[201]; char b,c; cin>>a; cin>>b>>c; //遍历数组a，将b字符换成c字符 int i=0; while(a[i]!='\0'){ if(a[i]==b){ a[i]=c; } i++; } cout<<a<<endl; return 0; }