azeval

#include <fstream>
#include <string>

using namespace std;

ifstream cin("azeval.in");
ofstream cout("azeval.out");

const int MOD=26;

string exp;
int idx;

int eval();
int term();
int factor();

int power(int base,int exp)
{
    if(exp==0)return 1;
    if(exp%2==0)
    {
        int x=power(base,exp/2)%MOD;
        return x*x%MOD;
    }
    return base*power(base,exp-1)%MOD;
}

int main()
{
    for(int i=1;i<=3;i++)
    {
        cin>>exp;
        idx=0;
        cout<<(char)(eval()+'a')<<"\n";
    }
    return 0;
}

int eval()
{
    int rsp=term();

    while(exp[idx]=='+' || exp[idx]=='-')
        switch(exp[idx])
        {
            case'+':
            {
                ++idx;
                rsp=(rsp+term())%MOD;
                break;
            }
            case'-':
            {
                ++idx;
                rsp=(rsp-term()+MOD)%MOD;
                break;
            }
        }

    return rsp;
}

int term()
{
    int rsp=factor()%MOD;

    while(exp[idx]=='*' || exp[idx]=='/' || exp[idx]=='%' || exp[idx]=='^')
        switch(exp[idx])
        {
            case'^':
            {
                ++idx;
                rsp=power(rsp,factor())%MOD;
                break;
            }
            case'*':
            {
                ++idx;
                rsp=(rsp*factor())%MOD;
                break;
            }
            case'/':
            {
                ++idx;
                rsp=(rsp/factor())%MOD;
                break;
            }
            case'%':
            {
                ++idx;
                rsp=(rsp%factor())%MOD;
                break;
            }
        }
    return rsp%MOD;
}

int factor()
{
    int rsp=0;

    if(exp[idx]=='(')
    {
        ++idx;
        rsp=eval()%MOD;
        ++idx;
    }
    else
    {
        if(exp[idx]>='a' && exp[idx]<='z')
        {
            rsp=(exp[idx]-'a')%MOD;
            ++idx;
        }
    }
    return rsp%MOD;
}