#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(){ string s,s1=""; //定义一个字符串 cin>>s; //不能接受空格 int len=s.size(); for(int i=0;i<len/2;i++){ if(s[i] != s[len-1-i]){ cout<<"No"; return 0; } } cout<<"Yes"; }