#include<stdio.h>
#include<string.h>
int main()
{
int length(char a[]);
int b;
char a[20];
gets(a);
b=length(a);
printf("最长字符为%d\n",b);
return 0;
}
int length(char a[])
{
int i,j,point=0,place;
char b[20];
for(i=0,j=0;i<=strlen(a)-1;i++)
{
if( a[i]!=b[i])
j++;
b[i]=a[i];
if(a[i]<65||(a[i]>90&&a[i]<97)||a[i]>122)
if(j>point)
{
point=j;
place=i-j;
}
j=0;
for(i=0;i<=19;i++)
b[i]='\0';
}
return point;
}