题目链接：http://acm.nefu.edu.cn/JudgeOnline/problemshow.php?problem_id=520

#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
char str[105];
int main()
{
    while(cin>>str)
    {
        int sum[7]={0};
        int len=strlen(str);
        for(int i=0; i<len; i++)
        {
            if(str[i] == 'a')
              sum[0]++;
            if(str[i] == 'b')
              sum[1]++;
            if(str[i] == 'c')
              sum[2]++;
            if(str[i] == 'd')
              sum[3]++;
            if(str[i] == 'e')
              sum[4]++;
            if(str[i] == 'f')
              sum[5]++;
            if(str[i] == 'g')
              sum[6]++;
        }
        sort(sum,sum+7);
        cout<<sum[6]<<endl;
    }
    return 0;
}