s = input().strip()
count = 0

while True:
    applied_1 = 0
    # Apply operation 1 as many times as possible
    s_list = list(s)
    new_s = []
    i = 0
    n = len(s_list)
    while i <= n - 5:
        if (s_list[i] == 'p' and s_list[i+1] == 'h' and s_list[i+2] == 'n' and s_list[i+3] == 'o' and s_list[i+4] == 'm'):
            new_s.extend(['p', 'e', 'n', 'h'])
            applied_1 += 1
            i += 5
        else:
            new_s.append(s_list[i])
            i += 1
    # Add remaining characters
    while i < n:
        new_s.append(s_list[i])
        i += 1
    new_s_str = ''.join(new_s)
    if applied_1 > 0:
        count += applied_1
        s = new_s_str
        # Now apply operation 2 once
        # Remove all 'h's and replace 'e's with 'h's
        temp_list = []
        e_count = 0
        for c in s:
            if c != 'h':
                temp_list.append(c)
                if c == 'e':
                    e_count += 1
        # Replace 'e's with 'h's
        temp_list = ['h' if c == 'e' else c for c in temp_list]
        new_s_after_op2 = ''.join(temp_list)
        if new_s_after_op2 != s:
            count += 1
            s = new_s_after_op2
        else:
            break  # No change, can't apply operation 2
    else:
        # Try to apply operation 2 once
        temp_list = []
        e_count = 0
        for c in s:
            if c != 'h':
                temp_list.append(c)
                if c == 'e':
                    e_count += 1
        # Replace 'e's with 'h's
        temp_list = ['h' if c == 'e' else c for c in temp_list]
        new_s_after_op2 = ''.join(temp_list)
        if new_s_after_op2 != s:
            count += 1
            s = new_s_after_op2
        else:
            break  # No more operations possible

print(count)