# include <stdio.h>
 
int isPalindrome(char s[]){
	//関数の中だけを書き換えてください
	//回文になっているとき１を返す
	//回文になっていないとき０を返す
	int j,i=0;
	while(s[i]!='\0'){
		i++;
	}
	j=i/2;
	for(int k=0;k<=j;k++){
		printf("%d",j);
		printf("%c s[%d]",s[k],k);
		if(s[k]!=s[i-1-k]){
			printf("%c",s[k]);
			return 0;
		}
	}
	return 1;
}
 
//メイン関数は書き換えなくてよいです
int main(){
    char s[100];
    scanf("%s",s);
    isPalindrome(s);
    printf("\n");
    return 0;
}
 

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