122B - Lucky Substring - CodeForces Solution

brute force implementation *1000

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Python Code: 

n=input()
a=-1
f=n.count('4')
s=n.count('7')
if f>0:
    a=4
if s>f:
    a=7
print(a)

C++ Code: 

#include<bits/stdc++.h>
using namespace std;
#define ll long long int
int main()
{
    string s;
    cin>>s;
    int totalSeven = 0,totalFour = 0,i;
    for(i=0; s[i]; i++)
    {
        if(s[i]=='4')
            totalFour++;
        else if(s[i]=='7')
            totalSeven++;
    }
    if(!totalFour && !totalSeven)
        cout<<-1<<endl;
    else if(totalFour>=totalSeven)
        cout<<4<<endl;
    else
        cout<<7<<endl;
}


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