#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main()
char str[100];
int i,len,lastwordlen=0;
fgets(str,sizeof(str),stdin);
str[strcspn(str,"\n")]='\0';
len=strlen(str)
for(i=0;i<len;i++)
{
    if(!(isalpha(str[i])||isspace(str[i])))
    {
        printf("Invalid input\n");
        return 0;
    }
}
i=len-1;
while(i>=0&&str[i]=='')
{
    i--;
}
while(i>=0&&isalpha(str[i]))
{
    lastwordlen++;
    i--;
}
    {
        printf("%d\n",lastWordlen);
        retun 0;
    }